Furuno SONAR CH 270 User Manual
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OPERATOR'S MANUAL  
COLOR LCD  
SEARCHLIGHT SONAR  
MODEL  
CH-270  
www.furuno.co.jp  
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The paper used in this manual  
is elemental chlorine free.  
・FURUNO Authorized Distributor/Dealer  
9-52 Ashihara-cho,  
Nishinomiya, 662-8580, JAPAN  
Telephone : +81-(0)798-65-2111  
Fax  
: +81-(0)798-65-4200  
A : JUN 2003  
.
Printed in Japan  
All rights reserved.  
D : JUN. 03, 2010  
Pub. No. OME-13220-D  
(DAMI ) CH-270  
*00014699513*  
*00014699513*  
* 0 0 0 1 4 6 9 9 5 1 3 *  
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IMPORTANT NOTICES  
• This manual is intended for use by native speakers of English.  
• No part of this manual may be copied or reproduced without written permission.  
• If this manual is lost or worn, contact your dealer about replacement.  
• The contents of this manual and equipment specifications are subject to change without  
notice.  
• The example screens (or illustrations) shown in this manual may not match the screens  
you see on your display. The screen you see depends on your system configuration and  
equipment settings.  
• Store this manual in a convenient place for future reference.  
• FURUNO will assume no responsibility for the damage caused by improper use or  
modification of the equipment (including software) by an unauthorized agent or a third  
party.  
• When it is time to discard this product it must be done according to local regulations for  
disposal of industrial waste. For disposal in the USA, refer to the Electronics Industries  
Alliance (http://www.eiae.org/).  
i
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SAFETY INSTRUCTIONS  
WARNING  
WARNING  
ELECTRICAL SHOCK HAZARD  
Do not open the equipment.  
Keep heater away from equipment.  
A heater can melt the equipment's power  
cord, which can cause fire or electrical  
shock.  
Only qualified personnel  
should work inside the  
equipment.  
Use the proper fuse.  
Immediately turn off the power at the  
switchboard if water leaks into the  
equipment or something is dropped in  
the equipment.  
The fuse in the hull and transceiver units  
protects them from overcurrent, equipment  
fault and reverse polarity of the ship's  
mains. If a fuse blows replace it with fuse of  
the same amperage. Use of a fuse of  
different amperage can result in damage  
to the equipment.  
Continued use of the equipment can cause  
fire or electrical shock. Contact a FURUNO  
agent for service.  
Retract the transducer before turning  
off the power.  
Do not disassemble or modify the  
equipment.  
Damage to the transducer may result  
unless it is retracted.  
Fire, electrical shock or serious injury can  
result.  
Wait until the transducer switch [  
↑] lights  
steadily and then turn off the power.  
Immediately turn off the power at the  
switchboard if the equipment is emitting  
smoke or fire.  
Continued use can cause fatal damage to  
the equipment. Contact a FURUNO agent  
for service.  
Make sure no rain or water splash leaks  
into the equipment.  
Fire or electrical shock can result if water  
leaks in the equipment.  
ii  
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CAUTION  
CAUTION  
Do not exceed 20 knots when operating  
the equipment and do not exceed 15  
knots when lowering or raising the  
transducer.  
WORKING WITH THE SONAR OIL  
Precautions  
Q
Keep oil away from eyes. Wear pro-  
tective goggles when working with the oil.  
The oil can cause inflammation of the  
eyes.  
The transducer shaft may become  
damaged.  
Q
Do not touch the oil. Wear protective  
Do not use the equipment for other  
than its intended purpose.  
gloves when working with the oil. The  
oil can cause inflammation of the skin.  
Do not ingest the oil. Diarrhea and  
Q
Wrongful use of the equipment may result  
in personal injury or damage to the  
equipment.  
vomiting may result.  
Keep the oil out of reach of children.  
Q
Emergency procedures  
Q
If the oil enters eyes, flush with clean  
water about 15 minutes. Consult a  
physician.  
If the oil is ingested, see a physician  
immediately.  
If the oil contacts skin, wash with soap  
Q
WARNING LABELS  
Warning labels are attached to the  
display, transceiver and hull units. Do  
not remove the labels. If a label is  
missing or illegible, contact a FURUNO  
agent or dealer.  
Q
and water.  
Disposal of oil and its container  
Dispose of oil and its container in accord-  
ance with local regulations. For further  
details, contact place of purchase.  
Name: Warning Label (1)  
WARNING  
Type: 86-003-1011-0  
Code No.: 100-236-230  
To avoid electrical shock, do not  
remove cover. No user-serviceable  
parts inside.  
Storage  
Seal container to keep out foreign material.  
Store in dark, cool place.  
DISPLAY UNIT,  
TRANSCEIVER  
UNIT  
TFT LCD  
Name: "Finger Catch"  
WARNING  
Warning Label  
Moving shaft can pinch and cut.  
Keep hands clear while operating.  
Lockout power before servicing.  
Type: 06-021-4015-0  
Code No.: 100-281-590  
The high quality TFT (Thin Film Transistor)  
LCD displays 99.99% of its picture ele-  
ments. The remaining 0.01% may drop out  
or light, however this is an inherent property  
of the LCD; it is not a sign of malfunction.  
HULL UNIT  
iii  
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TABLE OF CONTENTS  
FOREWORD....................................................................................................................... vii  
SYSTEM CONFIGURATION ............................................................................................ ix  
1. OPERATIONAL OVERVIEW....................................................................................... 1-1  
1.1 Control Description.................................................................................................... 1-1  
1.2 Remote Controller..................................................................................................... 1-2  
1.3 Turning the Power On/Off.......................................................................................... 1-3  
1.3.1 Power on ........................................................................................................ 1-3  
1.3.2 Power off ........................................................................................................ 1-4  
1.4 Raising, Lowering the Transducer............................................................................. 1-5  
1.4.1 Lowering the transducer ................................................................................. 1-5  
1.4.2 Raising the transducer.................................................................................... 1-5  
1.5 Choosing a Display ................................................................................................... 1-6  
1.6 Adjusting Screen Brilliance, Panel Dimmer................................................................ 1-7  
1.7 Adjusting the Gain..................................................................................................... 1-7  
1.8 Basic Menu Operation............................................................................................... 1-8  
2. HORIZONTAL MODE.................................................................................................. 2-1  
2.1 Operational Overview................................................................................................ 2-1  
2.2 Typical Horizontal Mode Display ............................................................................... 2-2  
2.3 Choosing the Range.................................................................................................. 2-3  
2.4 Choosing Sector Width.............................................................................................. 2-4  
2.5 Choosing Train Center .............................................................................................. 2-5  
2.6 Choosing the Tilt Angle ............................................................................................. 2-6  
2.6.1 Choosing the tilt angle .................................................................................... 2-6  
2.6.2 Relation between tilt angle and echo .............................................................. 2-7  
2.6.3 Tilt angle for surface fish................................................................................. 2-8  
2.6.4 Suitable tilt angle ............................................................................................ 2-9  
2.7 Choosing the Training Speed...................................................................................2-10  
2.8 Finding Echo Position with the Cursor......................................................................2-10  
2.9 Event Marker............................................................................................................2-11  
2.9.1 Inscribing the event marker............................................................................2-11  
2.9.2 Deleting all event markers..............................................................................2-12  
2.10 Depth and Horizontal Range Markers.......................................................................2-12  
2.11 Adjusting the Picture ................................................................................................2-13  
2.11.1Suppressing bottom and surface reflections ..................................................2-13  
2.11.2Suppressing bottom tail .................................................................................2-14  
2.11.3Displaying weak echoes clearly ....................................................................2-14  
2.11.4Erasing weak echoes.....................................................................................2-17  
2.11.5Enlarging fish echoes (horizontal expansion display).....................................2-18  
2.12 Target Lock..............................................................................................................2-19  
2.12.1Choosing target lock mode ............................................................................2-19  
2.12.2Manual reverse mode ....................................................................................2-19  
2.12.3Position mode................................................................................................2-20  
2.12.4Echo mode ....................................................................................................2-21  
iv  
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TABLE OF CONTENTS  
2.13 Horizontal Menu Overview....................................................................................... 2-23  
2.14 Interpreting the Horizontal Display........................................................................... 2-25  
2.14.1How the horizontal mode picture is painted................................................... 2-25  
2.14.2Sample echo displays ................................................................................... 2-26  
2.14.3Combination display examples...................................................................... 2-30  
3. VERTICAL SCAN MODE.............................................................................................3-1  
3.1 Operational Overview ................................................................................................ 3-1  
3.2 Displaying Vertical Scan Mode Display......................................................................3-2  
3.2.1 Typical vertical scan mode display .................................................................. 3-2  
3.2.2 How the vertical scan picture is painted........................................................... 3-3  
3.2.3 Horizontal/vertical scan display ....................................................................... 3-4  
3.3 Choosing the Range.................................................................................................. 3-6  
3.4 Choosing Train Center............................................................................................... 3-6  
3.5 Choosing Display Sector............................................................................................3-7  
3.6 Choosing Sector Center............................................................................................. 3-8  
3.7 Choosing the Tilt Speed............................................................................................. 3-9  
3.8 Finding Echo Position with the Cursor ....................................................................... 3-9  
3.9 Event Marker ........................................................................................................... 3-10  
3.9.1 Entering an event marker .............................................................................. 3-10  
3.9.2 Deleting all event markers............................................................................. 3-11  
3.10 Depth and Horizontal Range Markers...................................................................... 3-11  
3.11 Adjusting the Picture................................................................................................ 3-12  
3.11.1Displaying weak echoes clearly..................................................................... 3-12  
3.11.2Suppressing noise and interference .............................................................. 3-14  
3.11.3Gain adjustment............................................................................................ 3-14  
3.11.4Resolution color ............................................................................................ 3-15  
3.11.5Suppressing clutter........................................................................................ 3-15  
3.11.6Choosing horizontal range expansion factor.................................................. 3-16  
3.12 Interpreting the Vertical Scan Display ...................................................................... 3-17  
3.12.1Sample echo displays ................................................................................... 3-17  
4. ECHO SOUNDER MODE.............................................................................................4-1  
4.1 Operational Overview ................................................................................................ 4-1  
4.2 Typical Echo Sounder Display...................................................................................4-2  
4.3 Choosing the Range.................................................................................................. 4-3  
4.4 Train Direction ........................................................................................................... 4-4  
4.5 Choosing Tilt Angle.................................................................................................... 4-4  
4.6 Choosing Picture Advance Speed ............................................................................. 4-4  
4.7 Measuring Range by Cursor......................................................................................4-5  
4.8 Event Marker ............................................................................................................. 4-5  
4.8.1 Inscribing the event marker ............................................................................. 4-6  
4.8.2 Deleting all event markers............................................................................... 4-6  
4.9 Range Marker............................................................................................................ 4-7  
4.10 Adjusting the Picture.................................................................................................. 4-8  
4.10.1Displaying weak echoes clearly....................................................................... 4-8  
4.10.2Finding echo strength (A-scope display)........................................................ 4-10  
4.10.3Gain adjustment............................................................................................ 4-11  
v
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TABLE OF CONTENTS  
4.10.4Resolution color.............................................................................................4-11  
4.10.5Suppressing clutter........................................................................................4-12  
5. MENU OPERATION .................................................................................................... 5-1  
5.1 COM1 Menu.............................................................................................................. 5-1  
5.1.1 Displaying the COM1 menu ............................................................................ 5-1  
5.1.2 COM1 menu description ................................................................................. 5-1  
5.2 COM2 Menu.............................................................................................................. 5-2  
5.2.1 Displaying the COM2 menu ............................................................................ 5-2  
5.2.2 COM2 menu description ................................................................................. 5-2  
5.3 Short-cut Menu, Preset Menu.................................................................................... 5-3  
5.3.1 Choosing short-cut or preset........................................................................... 5-3  
5.3.2 Changing setting of preset key........................................................................ 5-5  
5.3.3 Changing setting of short-cut key.................................................................... 5-6  
5.4 SYSTEM Menu ......................................................................................................... 5-8  
5.4.1 Displaying the SYSTEM menu........................................................................ 5-8  
5.4.2 SYSTEM SETTING 1 menu description.......................................................... 5-9  
5.4.3 SYSTEM SETTING 2 menu description.........................................................5-11  
5.4.4 Sonar (horizontal) mode range settings .........................................................5-13  
5.4.5 Vertical scan mode range settings .................................................................5-14  
5.4.6 Echo sounder mode range settings................................................................5-15  
5.4.7 Track range settings ......................................................................................5-16  
5.4.8 Color palette ..................................................................................................5-17  
5.4.9 Language.......................................................................................................5-18  
5.4.10System backup ..............................................................................................5-18  
5.4.11Loading backup data......................................................................................5-18  
5.4.12Transducer frequency adjustment..................................................................5-19  
5.4.13Demonstration mode......................................................................................5-19  
5.4.14Restoring all default settings..........................................................................5-20  
6. MAINTENANCE, TROUBLESHOOTING .................................................................... 6-1  
6.1 Preventive Maintenance............................................................................................ 6-1  
6.2 Cleaning the Equipment............................................................................................ 6-1  
6.3 Hull Unit Maintenance ............................................................................................... 6-2  
6.3.1 Lubrication...................................................................................................... 6-2  
6.3.2 Manually raising, lowering transducer............................................................. 6-2  
6.4 Transducer Maintenance........................................................................................... 6-3  
6.5 Fuse Replacement .................................................................................................... 6-3  
6.6 Troubleshooting ........................................................................................................ 6-4  
6.7 Error Messages......................................................................................................... 6-5  
6.8 Diagnostics ............................................................................................................... 6-6  
6.9 Test Pattern............................................................................................................... 6-8  
MENU TREE .................................................................................................................... M-1  
SPECIFICATIONS ......................................................................................................... SP-1  
INDEX ..............................................................................................................................IN-1  
vi  
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FOREWORD  
Thank you for purchasing the CH-270 Color LCD Searchlight Sonar. We are confident you  
will discover why FURUNO has become synonymous with quality and reliability.  
Dedicated in the design and manufacture of marine electronics equipment for more than  
half a century, FURUNO Electric Company has gained an unrivaled reputation as a world  
leader in the industry. This is the result of our technical excellence as well as our worldwide  
distribution and service network.  
Please carefully read and follow the safety information and operating and maintenance  
instructions set forth in this manual before attempting to operate the equipment and conduct  
any maintenance. Your sonar will perform to the utmost of its ability only if it is operated and  
maintained in accordance with the correct procedures.  
Features  
The CH-270 displays underwater objects on a bright 10.4-inch color LCD display, in 8 (or  
16) colors according to received echo strengths. Alternatively, the interface unit permits  
connection of a commercial CRT or LCD monitor to act as the main, backup or remote  
display. Operating frequency is 180 kHz.  
The main features of the CH-270 are  
• High definition active matrix color LCD.  
• Target lock on a fish school or stationary position (reef, etc.).  
• Audible detection of echoes frees the operator from continuous watch of the display.  
• Compact display and hull units permit installation where space is limited.  
• Interface IF-8000 permits use of a commercial monitor in lieu of FURUNO-supplied  
display unit.  
• Automatic pulselength switching for optimum performance in short and long ranges.  
• Eight operational modes: Horizontal, Horizontal Expansion, Vertical Scan, Echo Sounder,  
Horizontal/Vertical Scan, Horizontal/History, Horizontal/Video Plotter and  
Horizontal/Strata.  
• Automatic retraction of transducer at operator-chosen ship’s speed between 5 and 15  
knots.  
• CUSTOM MODE keys provide one-touch setup of the equipment or short-cut key  
function.  
• Tracing of ship’s track with connection of position-fixing equipment (GPS, etc.).  
• One of the echo strengths may be displayed in white to enhance the specific echo level.  
• The “Vertical Search” feature provides a cross-sectional view of the vertical plane, which  
is useful for evaluating fish school concentration.  
vii  
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FOREWORD  
Usage Precautions  
• The Motion Sensor MS-100 compensates for ship’s pitching and rolling. However, it does  
not compensate for load unbalance. Use Clinometer BS-704 if compensation for load  
unbalance is required.  
• If the equipment will not be used for a long time, shut off the power to it at the mains  
switchboard to prevent battery discharge.  
• If the soundome is to be operated while the ship is dry-docked, set the transmitter output  
power to “MIN(imum),” on the COM1 menu. Damage to the train/tilt assy. may result if the  
transducer is operated with maximum transmitter power when the ship is dry-docked.  
• When the ship is dry-docked check the soundome for signs of electrolytic corrosion. Find  
the reason for the corrosion and attach a zinc plate to the location as an anticorrosion  
measure.  
viii  
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SYSTEM CONFIGURATION  
CH-270 (350 stroke)  
INTERFACE UNIT  
IF-8000  
DISPLAY UNIT MU-100C  
Navigator  
Control Unit  
Display  
Unit  
External  
Monitor  
XDR  
GAIN  
SECTOR  
TRAIN  
RANGE  
TILT  
M
SUB  
AIN  
FULL  
HALF  
FAST  
SCAN  
BRILL  
TARGET  
R/B  
M
ENU  
Remote  
POWER  
EVENT  
DISPLAY MODE  
CUSTOM MODE  
Controller  
CONTROL UNIT CH-252  
12-32VDC  
HULL UNIT  
SPEAKER  
DATA/VIDEO OUT  
TRANSCEIVER UNIT  
CH-273  
MOTION SENSOR  
Speaker  
12-32 VDC  
Motion Sensor  
Note 1: The CH-270 is supplied  
with or without a display  
unit. For connection of  
12/24 VDC  
HULL UNIT  
CH-181  
locally supplied monitor, an  
interface unit is provided.  
The drawing above shows  
the system configuration  
with the MU-100C.  
Note 2: For use of a locally  
supplied monitor, connect  
it and control unit to the  
interface unit.  
: Standard  
: Option  
: Local Supply  
How to remove the hard cover  
(system with locally supplied monitor only)  
Place your thumbs at the locations shown with  
circles in the illustration at right, and then lift the  
cover while pressing it with your thumbs.  
ix  
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SYSTEM CONFIGURATION  
CH-270 (250 stroke)  
INTERFACE UNIT  
IF-8000  
DISPLAY UNIT MU-100C  
Navigator  
Control Unit  
DIsplay Unit  
External  
Monitor  
XDR  
GAIN  
SECTOR  
TRAIN  
RANGE  
TILT  
M
SUB  
AIN  
FULL  
HALF  
FAST  
SCAN  
BRILL  
TARGET  
R/B  
M
ENU  
Remote  
POWER  
EVENT  
DISPLAY MODE  
CUSTOM MODE  
Controller  
CONTROL UNIT CH-252  
12-32VDC  
HULL UNIT  
DATA/VIDEO OUT  
TRANSCEIVER UNIT  
CH-273  
SPEAKER  
MOTION SENSOR  
CONTROL BOX  
Speaker  
12-32 VDC  
Motion Sensor  
Note 1: The CH-270 is supplied  
with or without a display  
unit. For connection of  
locally supplied monitor, an  
interface unit is provided.  
The drawing above shows  
the system configuration  
with the MU-100C.  
12/24 VDC  
HULL UNIT  
CH-184  
Note 2: For use of a locally  
supplied monitor, connect  
it and control unit to the  
interface unit.  
: Standard  
: Option  
: Local Supply  
x
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1. OPERATIONAL OVERVIEW  
1.1 Control Description  
Chooses center bearing of training sector.  
Chooses detection range.  
Switches training sector between 180 and 360 .  
(horizontal mode), or 180 (vertical scan mode).  
Turns the power on/off.  
Chooses scan speed (sonar)/picture  
advancement speed (echo sounder).  
Raises the transducer.  
Adjusts receiver  
Controls tilt angle.  
Selects center direction of  
the vertical scanning sector.  
sensitivity.  
Chooses width of  
training sector.  
Turns target lock on/off.  
Omnipad  
Shifts cursor.  
Selects menu items, options.  
Choose display mode.  
Lowers the transducer.  
Provide short-cut  
key or one-touch  
setup.  
Opens/closes  
menu.  
Adjusts display  
brilliance* and  
panel dimmer.  
Inscribes/erases event  
marker.  
Inscribes/erases range  
and bearing markers.  
Swithes control between  
main and sub windows in  
combination displays.  
Sub window is circumbscribed  
with a red rectangle when it  
is selected.  
* FURUNO  
monitor  
only.  
Horizontal/Video Plotter  
Horizontal/History  
Horizontal/Vertical Scan  
Horizontal/Strata  
Horizontal  
Echo Sounder  
Vertical Scan  
Horizontal Expansion  
Control unit  
1-1  
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1. OPERATIONAL OVERVIEW  
1.2 Remote Controller  
The Remote Controller CH-256 (option) provides armchair control over range, tilt, target  
lock and training range.  
Choose display  
range.  
Choose tilt angle.  
Chooses training range.  
for full circle 360 (horizontal mode)  
or half circle 180 (vertical scan mode).  
Enables/disables  
target lock.  
Remote controller  
Note: The remote controller can also be used with a commercial monitor.  
1-2  
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1. OPERATIONAL OVERVIEW  
1.3 Turning the Power On/Off  
1.3.1 Power on  
Press the [POWER] switch on the control unit until you hear a “click.” A beep sounds, the  
lamp above the switch lights and the startup display appears (for four seconds).  
M O D E L  
:
C H - 2 7 0 1 8 0 k H z  
Startup display  
Note 1: Wait at least five seconds before reapplying the power.  
Note 2: The first time the power is applied after installation, the language selection screen  
appears. English is selected; press the [MENU] key to erase the screen and  
continue.  
Please set language.  
([  
/
]: Select, [MENU]: Enter)  
XXXX ... For Japanese Customer  
XXXX  
English  
(Japanese)  
Language selection screen  
Note 3: The example screens shown in this manual may not match the screens you see on  
your display. The screen you see depends on your system configuration and  
equipment settings.  
1-3  
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1. OPERATIONAL OVERVIEW  
1.3.2 Power off  
1. Press the [©] switch on the control unit. The lamp above the switch blinks while the  
transducer is being raised and lights steadily when it is fully raised.  
Transducer status indicator  
• Up arrow is filled when transducer  
30  
has been retracted into the tank.  
• Down arrow is filled when transducer  
has been fully lowered.  
25  
• Appropriate arrow flashes during  
raising/lowering of transducer.  
NOTE: When the transducer is being  
raised automatically (auto raise feature),  
the arrows are filled and the up arrow  
flashes. When the transducer has been  
fully retracted, the up arrow lights  
and the down arrow becomes hollow.  
Transducer status indicator  
2. Press the [POWER] switch after the lamp above the [©] switch lights steadily.  
Note 1: The transducer is automatically retracted into the tank if the [POWER] switch is  
pressed before retracting the transducer. However, for safety purposes, make it a  
habit to retract the transducer before turning off the power.  
Note 2: After changing settings, wait at least one minute before turning off the equipment to  
allow the equipment to memorize settings. This will enable the equipment to start  
up with the last-used settings. No harm will result to the equipment if this is not  
done.  
Note 3: The hull unit remains powered when power is turned off at the control unit.  
Therefore, if the sonar is not to be used for a long period turn it off at ship’s mains  
switchboard.  
1-4  
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1. OPERATIONAL OVERVIEW  
1.4 Raising, Lowering the Transducer  
1.4.1 Lowering the transducer  
With the boat at the fishing ground, press the [ª] switch to lower the transducer. The lamp  
above the switch blinks while the transducer is being lowered and lights when it is  
completely lowered. The down arrow on the transducer status indicator is filled when the  
transducer is completely lowered.  
CAUTION  
Do not exceed 20 knots when operating  
the equipment and do not exceed 15  
knots when lowering or raising the  
transducer.  
The transducer may become damaged.  
1.4.2 Raising the transducer  
Press the [©] switch to raise the transducer. The lamp above the switch blinks while the  
transducer is being raised and lights steadily when it is fully raised. The up arrow of the  
transducer status indicator is filled when the transducer is fully raised.  
Note 1: With speed input, the transducer can be automatically raised when the ship’s speed  
exceeds a speed between 5 and 15 knots. For further details about the automatic  
retraction feature, see AUTO RETRACTION in paragraph 5.4.3.  
Note 2: Audio and visual alarms may be released when ship speed goes higher than  
allowed for a certain transducer operation. For further details, see SPEED ALARM  
MESSAGE in paragraph 5.4.3.  
1-5  
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1. OPERATIONAL OVERVIEW  
1.5 Choosing a Display  
This sonar has eight display modes and you may choose one with one of the DISPLAY  
MODE keys. Refer to the chapter shown in the illustration for more information about each  
mode.  
Key  
Picture  
Picture  
Key  
NAV  
NAV  
DATA  
DATA  
HORIZONTAL  
HORIZONTAL EXPANSION  
This mode provides 360 degree coverage.  
Useful for general search. (Chapter 2)  
Zoomed horizontal picture appears over  
the entire screen. (Chapter 2)  
NAV  
DATA  
NAV  
DATA  
or  
A-SCOPE  
DISPLAY  
Water temp/depth  
ECHO SOUNDER  
VERTICAL SCAN  
Using a fixed spot beam this display  
shows fish echoes below or around the  
vessel. (Chapter 4)  
Vertical section of underwater conditions  
appears on the entire screen. (Chapter 3)  
NAV DATA  
NAV DATA  
HORIZONTAL/VIDEO PLOTTER  
HORIZONTAL/HISTORY  
The horizontal picture appears in the main  
window and the video plotter picture, which  
traces ship's track, in the sub window.  
(Chapter 2)  
The horizontal picture appears in the main  
window; the history picture in the sub  
window. Useful for showing history of fish  
movement, distribution. (Chapter 2)  
NAV DATA  
NAV DATA  
HORIZONTAL/STRATA  
HORIZONTAL/VERTICAL SCAN  
The horizontal picture appears in the main  
window; the vertical scan picture in the sub  
window. Note that the vertical scan display  
may be located below the horizontal  
display, with both displays nearly equal  
in size. (Chapter 3)  
The horizontal picture appears in the main  
window; the strata picture in the sub window.  
The strata picture shows bottom undulatons  
in different colors. It is useful in bottom  
trawling to avoid projections. (Chapter 2)  
Display modes  
1-6  
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1. OPERATIONAL OVERVIEW  
1.6 Adjusting Screen Brilliance, Panel Dimmer  
Screen brilliance can be adjusted in nine levels and the panel dimmer (backlighting) in four.  
1. Press the [BRILL] key to open the dialog box for screen brilliance and panel dimmer. Do  
the next step within four seconds; otherwise the dialog box will be erased.  
BRILL:3  
DIMMER:3  
Brilliance, panel dimmer dialog box  
2. Operate ◄ or ► to adjust screen brilliance (0 is the lowest brilliance; 9 the highest). The  
[BRILL] key may also be operated to adjust brilliance.  
3. Operate ▲ or ▼ to adjust the panel dimmer (0 is the lowest level; 4 is the highest).  
4. Press the [MENU] key to register settings and close the dialog box. Note that the dialog  
box is automatically erased if there is no control operation within about four seconds.  
Note: The brilliance of a commercial monitor cannot be adjusted with the [BRILL] key. Use  
the associated control on the monitor.  
1.7 Adjusting the Gain  
The [GAIN] control adjusts the sensitivity of the receiver. Normally, the control is adjusted so  
that the bottom echo is displayed in reddish-brown mixed with red. Initially set the gain  
between “4” and “6” and then fine tune according to fishing ground, etc.  
Too High  
Too Low  
Proper  
How to adjust the gain  
1-7  
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1. OPERATIONAL OVERVIEW  
1.8 Basic Menu Operation  
The menu, consisting of seven menus, mostly contains items which once preset do not  
require frequent adjustment. Below is the procedure for basic menu operation.  
1. Press the [MENU] key to open the menu. The last-used menu is displayed. (In the  
example below, the COM2 menu is shown.)  
Note: Either PRESET or SHORT-CUT appears between ES and SYS at the top of the  
menu depending on the setting of CUSTOM KEY on the SYSTEM SETTING 1  
menu. For further details, see paragraph 5.3.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
DELETING TRACK  
WHITE MARKER  
SIG LEVEL  
NO  
OFF  
OFF  
16  
Dialog box appears here when  
a menu item is selected.  
COLOR  
BKGD COLOR  
2
: CHANGE  
MENU: END  
: SELECT  
COM2 menu  
2. To choose a menu, press ▲ to choose MENU at the top of the screen (if it is not already  
chosen) and then press ◄ or ► to choose menu desired.  
3. Press ▲ or ▼ to choose menu item desired. Menu help is provided at the bottom of the  
screen.  
4. Press ► to open the corresponding dialog box. The example below shows the dialog  
box for DELETING TRACK in the COM2 menu.  
DELETING TRACK  
NO YES  
Dialog box for deleting track  
5. Press ◄ or ► to choose option desired. If input of numeric data is required, use ◄ or ►  
to lower or raise the figure, respectively.  
6. Press ▲ or ▼ to close the dialog box and return to the menu, or press the [MENU] key  
to register your selection and close the menu.  
1-8  
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2. HORIZONTAL MODE  
2.1 Operational Overview  
The figure below shows the typical horizontal mode operating sequence.  
7. Set center bearing of train  
8. Set tilt angle.  
sector.  
6(a). Set scanning sector.  
5. Set range.  
1. Turn on the power.  
11. Adjust menu settings  
9. Adjust gain.  
(ex. TVG) as required.  
10. Measure range and  
bearing to target with cursor.  
4. Select appropriate  
horizontal mode.  
2. Lower the  
transducer.  
3. Adjust screen  
6(b). Select training sector for  
full circle.  
brilliance.  
Control unit  
2-1  
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2. HORIZONTAL MODE  
2.2 Typical Horizontal Mode Display  
Tilt angle indicator  
(Indicates transducer tilt angle.)  
Horizontal max. range  
30  
Range and bearing markers  
Vertical max.  
depth  
25  
Depth marker  
(See note  
below.)  
Tilt angle  
Tilt angle  
Sector marker  
Train indicator  
Demonstration  
mode  
Cursor data  
Interference  
Range rejector  
Transducer status indicator  
Filled arrow: Respective  
action completed  
Blinking arrow: Action in  
progress  
(DEMO)  
30  
16  
13  
B208  
+
R
T
40 m  
40  
N
25  
Bottom  
echo  
Bearing  
Target lock indicator  
marker  
Fish echo  
34 12. 343' N  
134 34. 213' W  
Position in latitude*,  
longitude*  
CSE  
SPD  
357  
9.9 kt  
ETA marker  
Own ship  
marker  
Course*, speed*  
E
W
Depth,  
water temperature*  
DEP  
35 m  
TMP 12.3 C  
Range  
marker  
CUR 11.0  
Tide direction*,  
tide speed*  
Gain setting  
2.0 kt  
Event  
marker  
GAIN  
5.3  
Cursor  
TVG LEVEL 4.0  
DISTANCE 200 m  
COLOR  
TVG level,  
distance settings  
9
8
B7  
16  
B234  
S
Color bar  
* Requires appropriate  
sensor.  
Range and bearing  
markers data  
Event  
marker  
data  
Ship's  
track*  
Current  
vector*  
North marker*  
N
Sweep indicator  
(Shows train position  
in horizontal mode.)  
W
E
Depth marker  
S
When depth data is input from  
external equipment, the depth  
marker shifts according to depth  
data. If the depth data is greater  
than the horizontal range, the  
depth marker disappears.  
Typical horizontal mode display  
With the tilt angle lowered, your ship is at the center of the screen. The bottom, which  
appears in reddish-brown color, is displayed as a circle and fish echoes appear within the  
circle.  
2-2  
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2. HORIZONTAL MODE  
2.3 Choosing the Range  
The [RANGE] control chooses the detection (display) range. Choose the range according  
to either the fish species being searched or the depth desired. 15 ranges are available.  
SEA SURFACE  
Range indicated  
BOTTOM  
on the screen.  
How to choose the range  
Default horizontal mode range settings  
Range No. Meters Feet  
1
2
3
4
5
6
7
8
10  
20  
40  
60  
80  
100  
120  
160  
200  
250  
300  
400  
500  
600  
800  
40  
80  
120  
200  
300  
400  
500  
600  
700  
800  
1000  
1200  
1500  
2000  
2500  
9
10  
11  
12  
13  
14  
15  
Normally, the range is set so that the bottom is traced at the lower part of the screen (like  
an echo sounder). Each time the [RANGE] control is operated the newly chosen range  
briefly appears in large characters at the screen top. Range is always displayed at the top  
right-hand corner of the screen.  
Note 1: Unit of range measurement may be chosen from among meters, feet, fathoms,  
passi/braza and Hiro (Japanese), with UNIT on the SYSTEM SETTING 1 menu.  
For further details, see UNIT in paragraph 5.4.2.  
Note 2: Ranges may be freely preset as desired. For further details, see paragraph 5.4.4.  
2-3  
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2. HORIZONTAL MODE  
2.4 Choosing Sector Width  
Sector means the width of the transducer training. The [SECTOR] control chooses the  
training (display) area among the sixteen positions shown in the table below. Clockwise  
rotation of the control increases the sector width; counterclockwise rotation decreases it.  
Display sector  
(shown: 96 )  
96°  
Display sector  
1
6
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
Sector  
width  
(°)  
24  
48  
72  
96 120 144 168 192 216 240 264 288 312 336 360  
In the full-circle mode (360°) the direction of training is clockwise; in the half-circle mode  
the direction is clockwise to counterclockwise alternately.  
One-touch selection of 360° sector  
Each pressing of the [FULL/HALF] key alternately chooses 360° sector (full circle) or 168°  
sector (half circle). If the [SECTOR] control is operated following the selection of the  
full-circle display, the next pressing of the [FULL/HALF] key presents the full-circle display.  
Sector set with  
SECTOR control  
Full circle  
Half circle  
FULL/HALF  
key  
FULL/HALF  
key  
168°  
How the FULL/HALF key works  
2-4  
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2. HORIZONTAL MODE  
2.5 Choosing Train Center  
The [TRAIN] control chooses the center direction of the detection range. The range of  
adjustment is 0° to 354° in increments of 6°. The chosen bearing is shown with a filled  
circle, the train indicator, on the bearing scale.  
0 (360 ) → 6 → 12 → 18 → ... 354  
Train indicator  
Sector  
Train center  
2-5  
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2. HORIZONTAL MODE  
2.6 Choosing the Tilt Angle  
2.6.1 Choosing the tilt angle  
The tilt angle shows the direction to which the sound wave is emitted. When the sound  
wave is emitted horizontally, the tilt angle is said to be 0° and when emitted vertically, 90°.  
To set a tilt angle, operate the [TILT] control. Watch the tilt angle indication and the tilt  
angle indicator at the top right corner of the screen. The tilt angle can be set in increments  
of 1°, from +5° (upward) to 90° (downward). Automatic tilt selection is also available. See  
AUTO TILT on page 2-24 for details.  
Choose the tilt angle depending on target fish. For surface fish choose a small angle  
(about 5°) to minimize sea surface reflections and for bottom fish, a large angle (about  
40°) to search a wide area.  
Soundome  
+5  
0 Horizontal direction  
Transducer  
Tilt angle setting range  
90 Vertical direction  
Sounding beam and tilt angle  
2-6  
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2. HORIZONTAL MODE  
2.6.2 Relation between tilt angle and echo  
Refer to the illustration below to see the relation between tilt angle and bottom echo.  
Case 1: Tilt angle 30° to 40°: This tilt angle will display the entire bottom since it is  
captured by the full width of the beam.  
Case 2: Tilt angle 10° to 20°: This tilt angle will only display half the bottom since it is only  
captured by the lower half of the beam.  
Case 3: Tilt angle 0° to 5°: This tilt angle may or may not capture the bottom since the  
returning echo is weak.  
The figure below illustrates how two fish schools “a” and “b” are displayed on the screen  
using three different tilt angles.  
Case 1(Tilt angle 30° to 40°): Fish school is obscured by the bottom.  
Case 2(Tilt angle 10° to 20°): Fish school is located above the bottom (midwater).  
Case 3(Tilt angle 0° to 5°):  
Fish school is located close to the bottom.  
Case 1  
Case 3  
Case 2  
Fish school "a"  
Fish school "a"  
Bottom  
Fish school "a"  
Bottom  
Bottom  
Fish school "b"  
Case 3  
Case 2  
Case 1  
Fish echo and tilt angle  
2-7  
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2. HORIZONTAL MODE  
Points to consider  
• Normally, a vertically distributed fish school is a better sonar target than the bottom,  
because it reflects the transmitted pulse back toward the transducer.  
• In case 3, both fish schools “a” and “b” are presented. Generally speaking, however,  
midwater fish schools tend to be larger than bottom fish schools and they are often  
displayed near the bottom on the display.  
• It is difficult to detect bottom fish when they are not distributed vertically.  
2.6.3 Tilt angle for surface fish  
Sound emitted from the sonar transducer forms an oval-shaped beam with a width of  
approximately 8° in the vertical direction (vertical beam width). The tilt angle is indicated  
by the angle between the center line of the beam and the horizontal plane. Then, if the tilt  
angle is set to 0°, the center line is parallel with the sea surface and one half of the  
emitted sound goes upward, toward the sea surface.  
This causes one half of the emitted sound to be reflected toward the transducer and  
displayed on the screen as sea surface reflections. When the sea is calm, since the sound  
is reflected just like a light hitting a mirror at a narrow incident angle, it propagates away  
and the sea surface reflections become negligible.  
However if the sea is not calm enough, they will become dominant and interfere with  
observation of wanted echoes. To minimize these sea surface reflections and to search  
fish schools effectively, the tilt angle is usually set between 5° and 6° so the upper portion  
of the beam becomes almost parallel with the sea surface. When the sea is rough, the tilt  
angle is slightly increased to lessen the affect of sea surface reflections.  
Sea surface  
Tilt angle 0°  
8°  
Sea surface  
Tilt angle 5-7°  
8°  
Tilt angle  
2-8  
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2. HORIZONTAL MODE  
2.6.4 Suitable tilt angle  
The figure below illustrates the relationship among tilt angle, depth and detection range.  
Refer to it to find out the suitable tilt angle for a given depth/detection range.  
Tilt angle and beam coverage (frequency 180 kHz, vertical beamwidth 8° at -3 dB  
)
Range (m)  
400  
(800)  
100  
200  
300  
0
°
°
(200)  
(400)  
(600)  
20(40)  
5
40(80)  
60(120)  
10°  
15°  
80(160)  
100(200)  
200(400)  
300 m  
Vertical width of sonar beam  
200 m  
100 m  
42 m  
14 m  
28 m  
8°  
Tilt angle and beam coverage  
2-9  
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2. HORIZONTAL MODE  
2.7 Choosing the Training Speed  
The training speed determines how fast the transducer scans the sounding sector. Two  
choices are available, normal speed and high speed, and one may be chosen with the  
[FAST SCAN] key. Each time the key is pressed, “NORM” (normal speed) or “FAST” (high  
speed) momentarily appears at the screen top.  
Normal (6°): 60 transmissions required to complete the full 360° picture.  
High (12°): 30 transmissions required to complete the full 360° picture.  
The time required to train a full circle depends on range used and other factors. The table  
below shows the time required to complete one full circle on each range.  
Range  
Unit  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
ft  
40  
80  
120  
200  
300  
400  
500  
600  
700  
800  
1000 1200 1500 2000 2500  
Time  
Norm  
11  
11  
11  
11  
11  
11  
11  
11  
11  
11  
11  
11  
13  
12  
15  
14  
17  
15  
20  
16  
25  
19  
30  
21  
37  
25  
49  
31  
61  
37  
required  
(sec) for  
one full  
circle  
Fast  
Unit  
m
10  
11  
20  
11  
40  
11  
60  
11  
80  
11  
100  
11  
120  
11  
160  
14  
200  
17  
250  
21  
300  
25  
400  
33  
500  
41  
600  
49  
800  
65  
Time  
Norm  
required  
(sec) for  
one full  
circle  
Fast  
11  
11  
11  
11  
11  
11  
11  
13  
14  
16  
18  
22  
26  
30  
38  
Note 1: The above values are for reference purposes. The actual training speed may vary.  
Note 2: The range setting must be at least 160 meters to activate high-speed training.  
2.8 Finding Echo Position with the Cursor  
The cursor measures horizontal range, depth and bearing. Operate the Omnipad to place  
the cursor where desired. Cursor position data appears at the top left-hand corner on the  
screen.  
Cursor position data  
: Horizontal range  
: Depth  
B: Bearing  
NAV  
DATA  
Cursor  
Location of cursor position data  
2-10  
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2. HORIZONTAL MODE  
2.9 Event Marker  
The event marker functions to mark important locations on the screen, and five may be  
inscribed. Each time the [EVENT] key is pressed the “latest event marker” ( ) is inscribed  
⊕
at the cursor location and all previously entered event markers are shown by the “previous  
event marker” (+). When the capacity for event markers is reached, the eldest event  
marker is erased from the screen to make room for the latest.  
Note 1: With position data input the event marker moves with ship’s movement. The  
event marker can be inscribed without position data, however it will be stationary.  
Note 2: The event marker cannot be inscribed from the sub window (strata, history and  
video plotter displays). It can only be inscribed from the main window.  
Note 3: The latitude and longitude position of the event marker can be output to a video  
plotter and that position inscribed on the plotter’s screen with the external  
waypoint mark (X). Each press of the [EVENT] key outputs event marker position.  
For further details, see TARGET L/L in paragraph 5.4.2.  
Note 4: The tilt angle must be less than 75 degrees to use this feature.  
2.9.1 Inscribing the event marker  
1. Operate the Omnipad to place the cursor on the location desired for an event marker.  
2. Press the [EVENT] key to inscribe the event marker. Event marker data appears at the  
bottom left-hand corner.  
"Latest event  
marker"  
Display area  
"Previous event marker"  
NAV  
DATA  
To delete all event markers,  
place the cursor outside the  
display area and press the  
[EVENT] key.  
Event marker data  
→: Horizontal range  
B: Bearing  
How to use the event marker  
2-11  
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2. HORIZONTAL MODE  
2.9.2 Deleting all event markers  
All event markers can be erased from the screen as follows:  
1. Operate the Omnipad to place the cursor outside the display area.  
2. Press the [EVENT] key to show the following dialog box. Do the next step within four  
seconds; otherwise the dialog box will be erased.  
DELETE EVENT MARK?  
NO YES  
3. Press ► to choose YES and then press the [MENU] key. All event markers are then  
erased from the screen.  
2.10 Depth and Horizontal Range Markers  
The horizontal range, depth and bearing to a fish school can be measured by using the  
range and bearing markers.  
1. Operate the Omnipad to place the cursor on the location desired.  
2. Press the [R/B] key to display the range and bearing markers. Horizontal range, depth  
and bearing to the cursor location are shown at the bottom right-hand corner of the  
screen.  
3. To erase the range and bearing markers, place the cursor at the intersecting point of  
the depth and horizontal markers or outside the display area and then press the [R/B]  
key.  
NAV  
DATA  
Bearing marker  
Range marker  
Range and bearing  
markers data  
→:Horizontal range  
↓: Depth  
B: Bearing from ship's bow  
Range and bearing markers  
2-12  
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2. HORIZONTAL MODE  
2.11 Adjusting the Picture  
2.11.1 Suppressing bottom and surface reflections  
In shallow fishing grounds, excessive sea surface and bottom reflections often interfere  
with wanted fish echoes and they cannot be eliminated sufficiently with the TVG controls.  
In such cases, try to reduce the output power, without turning down the gain. The picture  
becomes clearer when output power is reduced rather than when the gain is decreased.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ to choose the COM1 menu.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
TX POWER  
PULSELENGTH  
TX RATE  
MAX  
LONG  
10  
INT REJECT  
AGC  
OFF  
OFF  
0
AUDIO LEVEL  
: CHANGE  
MENU: END  
: SELECT  
COM1 menu  
3. Press ▲ or ▼ to choose TX POWER and then press ► to show the TX POWER  
dialog box.  
TX POWER  
MAX MIN  
4. Press ► to choose MIN. (For long range detection be sure to return the setting to  
MAX.)  
5. Press the [MENU] key to register your selection and close the menu.  
2-13  
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2. HORIZONTAL MODE  
2.11.2 Suppressing bottom tail  
As described earlier, fish schools near the bottom are sometimes difficult to detect  
because you have to discriminate fish echoes from the bottom reflections. To discriminate  
fish echoes near the bottom, choose the short Tx pulselength on the COM1 menu to  
decrease the tail of bottom reflections.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ to choose the COM1 menu.  
3. Press ▲ or ▼ to choose PULSELENGTH and then press ► to show the  
PULSELENGTH dialog box.  
PULSELENGTH  
LONG SHORT  
4. Press ► to choose SHORT. For long-range detection, be sure to return the setting to  
LONG.  
5. Press the [MENU] key to register your selection and close the menu.  
2.11.3 Displaying weak echoes clearly  
Echoes from targets (such as the bottom or a fish) return to the transducer in order of the  
distance to them, and when their intensities are compared at the transducer face, those  
from nearer targets are generally stronger when their reflecting properties are nearly equal.  
The sonar operator will be quite inconvenienced if these echoes are directly displayed on  
the screen, since he won’t be able to judge the actual size of the target from the size of  
echoes displayed on the screen. To overcome this inconvenience, use the TVG function. It  
compensates for propagation loss of sound in water: amplification of echoes on short  
range is suppressed and gradually increased as range increases, so that similar targets  
are displayed in similar intensities irrespective of the ranges to them.  
The TVG also functions to suppress unwanted echoes and noise which appear in a certain  
range area on the screen.  
Proper TVG setting  
Nearer target  
echoes appear  
in larger size.  
Without TVG  
Reduce  
gain for  
nearby  
areas,  
using  
Echoes of equal  
size targets are  
presented in the  
same color and size.  
Noise is rejected.  
Noise caused by  
strong reflection  
of surface  
TVG.  
turbulence.  
How TVG works  
Note: Excessive TVG may eliminate short-range echoes.  
2-14  
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2. HORIZONTAL MODE  
To adjust TVG:  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ or ► to choose HORZ.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
TVG LEVEL  
TVG DISTANCE  
GAIN ADJUST  
RES. COLOR  
CLUTTER  
4.0  
4.0  
0
LOG  
0
TARGET KEY  
LOCK MODE  
AUTO TILT  
REVERSE  
AUTO  
OFF  
: CHANGE  
MENU: END  
: SELECT  
HORZ menu  
3. Press ▲ or ▼ to choose TVG DISTANCE and then press ►. The following dialog box  
appears.  
TVG DISTANCE  
4.0  
GAIN  
Hi  
Lo  
200 m  
4. Press ◄ or ► to set TVG distance between 3.0 and 5.0 (130-320 m) to decrease  
amplification of echoes on short range. As a general rule, use a higher setting for low  
frequency transducer; a lower setting for high frequency transducer. The larger the  
figure the greater the distance at which TVG works. When you change a TVG setting  
(DISTANCE or LEVEL), the TVG line changes from solid to dashed; the solid line  
denotes current TVG setting.  
TVG Distance  
Setting  
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0  
. . . .  
. . . .  
10.0  
Meters  
3
8
20  
70  
10  
10  
40  
60  
100 130 160 200 250 320  
1000  
3280  
600  
Feet  
10  
2
30  
5
130 210 330 410 520 660 820 1040  
Passi/braza  
Fathoms  
20  
20  
40  
40  
60  
60  
80  
80  
100 120 150 180  
100 110 140 170  
２
5
550  
2-15  
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2. HORIZONTAL MODE  
5. Press the [MENU] key to register your selection and close the menu.  
6. To suppress reflections from the sea surface or plankton, choose TVG LEVEL and  
then press ►.  
TVG LEVEL  
4.0  
GAIN  
Hi  
Lo  
200 m  
7. Press ◄ or ► to adjust TVG LEVEL, considering sea conditions. The setting range is 0  
to 10, however a setting between 2.0 and 5.0 should provide satisfactory results. The  
higher the figure the less the gain over distance.  
8. Press the [MENU] key to register your selection and close the menu.  
Watch a distant fish echo which is approaching own ship. Observe the color of the fish  
echo while adjusting tilt angle so the fish echo is within the sounding beam. If the color  
and size of the echo stay the same as the echo approaches own ship, the TVG setting is  
proper. If the echo suddenly becomes smaller, the TVG level may be too high.  
2-16  
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2. HORIZONTAL MODE  
2.11.4 Erasing weak echoes  
Weak echoes such as interference can be erased from the screen. This is useful when  
you want to observe a fish school echo.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU.  
3. Press ◄ or ► to choose COM2.  
MENU  
COM1 COM2 HORZ VERT ES SHORT-CUT SYS  
DELETING TRACK  
WHITE MARKER  
SIG LEVEL  
NO  
OFF  
OFF  
16  
COLOR  
BKGD COLOR  
2
: CHANGE  
MENU: END  
: SELECT  
COM 2 menu  
4. Press ▲ or ▼ to choose SIG LEVEL.  
5. Press ► to open the dialog box.  
SIG LEVEL  
1
OFF  
14  
OFF  
8-color display: OFF, 1-6  
16-color display: OFF, 1-14  
(OFF, 1-14)  
Signal level dialog box  
6. Press ◄ or ► to choose echo color to erase. Pressing ► erases echoes from weak to  
strong in ascending order of strength. You can see which echo color is erased by  
watching the color bar.  
7. Press the [MENU] key to register your selection and close the menu.  
2-17  
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2. HORIZONTAL MODE  
2.11.5 Enlarging fish echoes (horizontal expansion display)  
Fish echoes may be enlarged by using the horizontal expansion display. Press the  
key to show the horizontal expansion display. The direction of expansion depends on the  
train direction as shown in the table below.  
Train center direction  
318° – 42°  
48° – 132°  
Position after expansion  
Moves to screen bottom  
Moves to left side of screen  
Moves to screen top  
Remarks  
For viewing forward  
For viewing starboard side  
For viewing aft  
138° – 222°  
228° – 312°  
Moves to right side of screen  
For viewing port side  
Sector marker  
Tilt angle  
Range  
Train indicator  
Cursor position data  
R
T
40 m  
40  
→14  
↓ 12  
B46  
+
30  
25  
Train  
position  
34° 12. 343' N  
134° 34. 213' W  
CSE  
SPD  
357  
9.9 kt  
DEP  
35 m  
TMP 12.3˚C  
CUR 11.0  
Own ship  
marker  
2.0 kt  
GAIN  
5.3  
TVG LEVEL 4.0  
DISTANCE 200 m  
COLOR  
Cursor  
Horizontal expansion display  
2-18  
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2. HORIZONTAL MODE  
2.12 Target Lock  
Three types of target lock modes are available.  
Manual reverse: The transducer train direction is reserved manually. This is the default  
target lock function setting and it may be used in both horizontal and  
vertical scan modes.  
Position:  
Tracks stationary position (such as a reef) using position data from a  
navigator. Available in the horizontal mode.  
Echo:  
Tracks fish echo either manually or automatically. Available in the  
horizontal mode.  
2.12.1 Choosing target lock mode  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ or ► to choose the HORZ menu.  
3. Press ▲ or ▼ to choose TARGET KEY.  
4. Press ► to show the following dialog box.  
TARGET KEY  
REVERSE POS ECHO  
5. Press ◄ or ► to choose option desired.  
6. Press the [MENU] key to register your selection and close the menu.  
2.12.2 Manual reverse mode  
The transducer train direction is reversed manually, thereby emphasizing possible fish  
echoes.  
Note: This function is inoperative in the echo sounder mode. In the vertical scan mode the  
manual reverse mode is automatically chosen regardless of the setting in  
paragraph 2.12.1.  
To activate the manual reverse mode:  
1. Choose REVERSE following the procedure in paragraph 2.12.1.  
2. Press the [TARGET] key to reverse the transducer train direction when a fish school  
appears. “REVERSE” momentarily appears at the screen top when the key is pressed  
and then the transducer train direction is reversed.  
2-19  
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2. HORIZONTAL MODE  
2.12.3 Position mode  
This mode tracks a stationary position (such as a reef) using position data fed from a  
navigator.  
Note 1: If the [TARGET] key is operated when using the horizontal/vertical scan  
combination mode, the train angle is automatically pointed toward target direction  
while the target lock marker is displayed. When target lock is canceled the  
previously used train angle is restored.  
Further, vertical search (see paragraph 5.3.3) is conducted with the vertical scan  
mode settings of range, tilt and display range. Note that the horizontal range  
settings of the vertical scan mode cover the horizontal mode range.  
Note 2: This mode requires position data. When there is no position data the message  
“NO POSITION DATA.” appears for five seconds and tracking is automatically  
cancelled. Check the navigator.  
Note 3: HORZ RANGE on the VERT menu cannot be adjusted while the position mode is  
active. Beeps sound when you attempt to change its setting.  
Note 4: The tilt angle must be less than 75 degrees to use this feature.  
To use the position mode:  
1. Choose POS following the procedure in paragraph 2.12.1.  
2. Use the Omnipad to choose the location to track.  
3. Press the [TARGET] key.  
The message “POS LOCK” appears momentarily at the screen top, the target lock  
marker is displayed at the cursor position and the target lock indicator appears at the  
top right-hand corner of the screen while tracking (with position data from external  
equipment) is occurring. If the position goes out of the display area, target lock is  
automatically cancelled and the target lock indicator and target lock marker disappear.  
The train range is fixed at 48° and train and tilt are automatically adjusted to track the  
position selected. The [SECTOR], [TRAIN], [TILT], [RANGE] and [FULL/HALF] controls  
are inoperative during tracking. When you attempt to operate them the message  
“TARGET LOCKING NOW” appears, accompanied by the aural alarm.  
Target lock indicator  
Target lock marker  
Target lock indicator  
4. To turn off the target lock, press the [TARGET] key again. The message “LOCK END”  
momentarily appears, the target lock marker and the target lock indicator disappear  
and previously used sector, train and tilt settings are restored. Also, the latitude and  
longitude indication now shows current position.  
2-20  
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2. HORIZONTAL MODE  
2.12.4 Echo mode  
The echo mode tracks a fish school, either automatically or manually. The default setting  
is automatic, and you can choose automatic or manual with “LOCK MODE” in the HORZ  
menu.  
Automatic echo tracking mode  
The automatic echo target lock function automatically tracks a fish school appearing in the  
operator-chosen target lock area. If the tracked fish school goes out of the area in the  
range direction, tracking is suspended until it or a new fish school comes into the area.  
To use the automatic echo tracking mode:  
1. Choose ECHO following the procedure in paragraph 2.12.1.  
2. Set LOCK MODE to AUTO on the HORZ menu.  
3. Press the [TARGET] key. The dialog box below appears at the screen center, the  
message “ECHO LOCK” appears for three seconds at the top of the screen, the target  
lock area appears in the current train area and the target lock indicator appears at the  
right-hand side of the screen.  
TARGET LOCK AREA.  
: INSIDE  
: OUTSIDE  
4. Use the [SECTOR] and [TRAIN] controls and the Omnipad to set the detection area.  
Do not include bottom echoes in the zone, so that target lock will not be activated by  
bottom echoes.  
When a target of red or reddish-brown color is detected in the target lock area, the  
target lock indicator blinks and a buzzer sounds to call the operator’s attention.  
Outer limit  
Target lock  
indicator  
NAV  
DATA  
Inner limit  
Target lock area  
2-21  
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2. HORIZONTAL MODE  
When the fish echo is lost the tilt angle is automatically changed as below to continue  
tracking the echo:  
Tilt changed to search [(A + 10°) → (A - 10°) →A]  
Detection area displayed once again and target  
lock indicator lights.  
A: Tilt angle at start of target lock  
5. To turn off the target lock, press the [TARGET] key again. The message “LOCK END”  
appears for three seconds at the screen top, the target lock indicator disappears and  
operation continues with current train and tilt settings.  
To use the manual echo tracking mode:  
1. Choose ECHO following the procedure in paragraph 2.12.1.  
2. Choose LOCK MODE to MANUAL on the HORZ menu.  
3. Press the [TARGET] key when a wanted target echo appears.  
The message “ECHO LOCK” appears along with the target lock indicator. Then, the  
transducer train direction is reversed and searching starts with the current tilt angle.  
When a target echo appears, the transducer train direction is again reversed  
automatically, the buzzer sounds and the target lock indicator blinks.  
If the fish echo is lost, the tilt angle is automatically changed as below to continue  
tracking.  
1. Tilt angle is changed by +10° (A+10°).  
(A is the tilt angle used when tracking began.)  
2. Tilt angle is changed by -20° (A-10°).  
3. If the echo could not be found, tracking is  
cancelled and tilt angle A is restored.  
4. To quit the target lock, press the [TARGET] key again. The message “LOCK END”  
appears momentarily.  
2-22  
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2. HORIZONTAL MODE  
2.13 Horizontal Menu Overview  
This section presents an overview of the items on the HORZ menu.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ or ► to choose the HORZ menu.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
TVG LEVEL  
TVG DISTANCE  
GAIN ADJUST  
RES. COLOR  
CLUTTER  
4.0  
4.0  
0
LOG  
0
TARGET KEY  
LOCK MODE  
AUTO TILT  
REVERSE  
AUTO  
OFF  
: CHANGE  
MENU: END  
: SELECT  
HORZ menu  
Horizontal menu description  
TVG LEVEL: Compensates for propagation loss of sound in water. For further details, see  
paragraph 2.11.3.  
TVG DISTANCE: Sets distance at which TVG works. For further details, see paragraph  
2.11.3.  
GAIN ADJUST: Adjust the gain here when there is disparity in gain level between the  
main and sub windows.  
RES. COLOR: Sets transfer characteristics of input signal level versus display echo level.  
Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG, and you can  
observe the characteristics of each by watching the color bar as you change the setting.  
LOG:  
Displays weak to strong echoes in their respective levels. This is the default  
setting, and is suitable for general use.  
LINEAR: Downplays the weak echoes when compared with LOG. Effective for  
suppressing weak echoes such as plankton.  
SQUARE: Strong echoes are emphasized more than in LINEAR.  
CUBE:  
Strong echoes are emphasized even more than in SQUARE.  
2-23  
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2. HORIZONTAL MODE  
CLUTTER: Low intensity echoes, often caused by sediments in water, are painted on the  
screen as a large number or random dots. This noise can be suppressed. The higher the  
number (setting) the weaker the echoes which are erased.  
TARGET KEY: Chooses target lock function among reverse, position and echo. For  
further details, see paragraph 2.12.  
LOCK MODE: Chooses how to track fish echo in “echo” target lock, automatically or  
manually. For further details, see paragraph 2.12.  
AUTO TILT: Turns automatic tilt on or off. The choices are 2°, 4°, 6°, and 10°.  
Automatic tilt adjusts the tilt angle in the following sequence:  
B → (B-A) → B → (B+A) → B → (B-A) → B → (B+A)…  
B: Current tilt angle  
A: Auto tilt setting  
For example, the tilt angle is 30° and the automatic tilt setting is 4°. Then, the tilt angle is  
changed in the following sequence: 30° → 26° → 30° → 34° → 30°→ 26° → 30° → 34°…  
2-24  
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2. HORIZONTAL MODE  
2.14 Interpreting the Horizontal Display  
This section provides information necessary for interpreting the horizontal display.  
2.14.1 How the horizontal mode picture is painted  
As shown below, the search beam is emitted from the soundome at a certain tilt angle.  
The information (target echoes) obtained by this beam is displayed in 6° (or 12°) sectors  
on the screen. With training through the entire area, a large cone shape area is formed,  
providing continuous pictures on the display.  
Search Beam  
Screen Display  
Tain: 6 *  
θ  
Tilt: θ  
Search Beam  
Training Direction  
*12 When high speed training is  
selected.  
* 60 transmissions required to complete full circle  
(30 in high speed training)  
How the horizontal mode picture is painted  
2-25  
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2. HORIZONTAL MODE  
2.14.2 Sample echo displays  
Bottom echoes  
When the tilt angle is changed, the bottom echo illustrated below will appear on the display.  
When the tilt is decreased (toward 0°), the bottom trace becomes wider and weaker. By  
observing the bottom condition on the display, you can prevent damage to the net.  
(A) Flat bottom  
Tilt angle: 10 to 15  
Decreased tilt angle  
Only half of  
vertical beam width  
captures the bottom.  
(B) Flat bottom  
Tilt angle: 20 or more  
Bottom is displayed  
narrower and in  
stronger colors when  
compared to (A).  
(C) Sloping bottom  
Tilt angle: 20 or more  
Shallow bottom  
is displayed in  
a strong color  
and with a  
short tail.  
Bottom  
The deeper, sloping  
bottom echo is displayed  
in a weak color and  
with a long tail.  
Bottom echoes  
2-26  
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2. HORIZONTAL MODE  
Fish schools  
A fish school appears as a mass of echoes on the screen. The color of the mass shows  
the density of fish schools on the sonar beam. To find distribution and center point of a fish  
school, try several different tilt angles.  
(A) Sea surface fish  
Tilt angle: 0 to 10  
Bottom echo not  
displayed because  
of decreased tilt angle.  
Sea surface  
Fish  
school  
reflections are  
present.  
Sea surface  
reflections  
(B) Midwater, bottom fish Tilt angle: 30 or more  
Fish echo which appears before bottom can be detected.  
Bottom  
Fish  
school  
Large midwater  
fish school is  
present.  
Tilt angle: 0 to 20  
Fish echo which appears together with  
or after bottom can be detected.  
Fish  
school  
Bottom  
When the tilt angle is shallow,  
the reflection echo from bottom  
is weak and the fish echo  
which appears from bottom  
is easy to find.  
Fish schools  
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2. HORIZONTAL MODE  
Sea surface reflections  
To reduce sea surface reflections, set the tilt angle to 5° or lower, so the upper edge of the  
sonar beam does not hit the sea surface, or adjust TVG. When a decreased tilt angle is  
used, sea surface reflections cover a large area as illustrated below.  
Sea surface  
Tilt angle  
indication  
8
Sea surface  
reflections  
Sea surface  
8
Sea surface reflections  
Wake  
A wake produced by own ship or another ship can be a strong reflecting object when a  
decreased tilt angle is used. As the wake appears as a thick continuous line, it can be  
easily distinguished from a fish school. A wake contains many air bubbles which attenuate  
ultrasonic energy, making it difficult to sound beyond the wake.  
Other  
ship  
Own  
ship  
Own ship's  
screw noise  
Wake produced  
by other ship  
Own ship's wake  
Own ship's  
screw noise  
(produced when  
own ship turned)  
Wake  
2-28  
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2. HORIZONTAL MODE  
Sidelobe echo (false echo)  
An ultrasonic wave is emitted in the direction set by the [TILT] control (main beam),  
however there are some emissions outside the main beam. These are called sidelobes.  
The energy of the sidelobe is fairly weak but when the water is comparatively shallow and  
the bottom is rocky and hard, strong signals are detected by the sidelobe. These are  
represented on the display as a false echo as shown below.  
Mainlobe echo  
Sidelobe echo  
Sidelobe  
Mainlobe  
The bottom echo  
detected by sidelobe  
appears at a certain  
tilt angle when the  
sidelobe points ver-  
tically. Also, poor  
soundome projection  
may result in a similar  
false echo.  
Sidelobe echoes  
Noise and interference  
When the fishing ground is crowded with many fishing boats, the sonar is subject to  
interference from ultrasonic equipment (echo sounder or sonar) on other boats as well as  
those on own ship.  
For instance, interference from the sonar on other boats will show itself on the display as  
in (A) in the figure below. This interference can be suppressed by changing the Tx rate on  
the COM1 menu. Noise from marine life shows itself on the displays as in (B) in the figure  
below. This type of noise can be suppressed with the interference rejector on the COM1  
menu.  
(A) Inteference from  
other sonars (yours  
or other's)  
(B) Interference from  
marine life  
Noise and interference  
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2. HORIZONTAL MODE  
2.14.3 Combination display examples  
Horizontal/history display  
Press the  
key to display the horizontal/history display.  
Tilt angle  
Cursor position data  
Range  
Tilt angle indicator  
→17  
↓ 14  
B148°  
+
30  
R
T
40 m  
40°  
Interference rej. ON  
Target lock indicator  
25  
Transducer status  
indicator  
Own ship  
marker  
34° 12. 343' N  
Position in latitude  
and longitude*  
Course*, speed*  
134° 34. 213' W  
Train  
position  
CSE 357° SPD 9.9 kt  
Fish echo  
Bottom echo  
Cursor  
* Requires appropriate  
sensor input.  
History Display  
(sub window)  
Horizontal Display  
(main window)  
Horizontal/history display  
The horizontal display appears in the main window; the history display in the sub window.  
The length of the picture displayed in the history display is equal to about four full-circle  
pictures. Thus the history display lets you observe the history of fish movement and  
distribution. It is also useful for detecting bottom fish, reefs and sunken vessels.  
Note that the history display cannot be adjusted.  
2-30  
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2. HORIZONTAL MODE  
Horizontal/video plotter display  
Press the  
key to display the horizontal/video plotter display.  
Tilt angle  
Range  
Cursor position data  
Tilt angle indicator  
→18  
↓ 15  
B154  
+
30  
R
T
40 m  
40  
Interference rej. ON  
Target lock indicator  
25  
Transducer status  
indicator  
Own ship  
marker  
34 12. 343' N  
134 34. 213' W  
Position in latitude  
and longitude*  
Course*, speed*  
Train  
position  
CSE 357 SPD 9.9 kt  
Sonar range marker  
(Radius changes with  
video plotter range.)  
Track*  
Event marker  
(Entered from  
horizontal mode)  
Event marker  
Cursor  
→15  
B 195  
500  
Scale  
* Requires appropriate  
sensor.  
Event marker data  
Track*  
Video Plotter Display  
(sub window)  
Horizontal Display  
(main window)  
Horizontal/Video Plotter display  
The horizontal display appears in the main window; the video plotter display, which mainly  
traces ship’s track, in the sub window. Compared to the horizontal display the video  
plotter’s range is much longer. For example, an event marker entered on the horizontal  
display disappears from that display when it goes out of the current range. However, it  
remains on the video plotter display for a much longer time when a long range scale is  
used. This can be useful when you want to return to the location marked with an event  
marker. To show track on the horizontal display the tilt angle must be less than 75  
degrees.  
You may switch control between the horizontal display and the video plotter display with  
the [MAIN/SUB] key. The message MAIN WINDOW CONTROLLABLE or SUB WINDOW  
CONTROLLABLE appears with each pressing of the key. A red rectangle circumscribes  
the sub window when it is selected. With the video plotter display selected you may  
change its range with the [RANGE] control.  
Note: Controls other than RANGE may only be operated from the main window. When  
you attempt to operate them when the sub window is selected the message  
SELECT MAIN WINDOW appears.  
2-31  
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2. HORIZONTAL MODE  
Horizontal/strata display  
Press the  
key to display the horizontal/strata display.  
Tilt angle  
Tilt angle indicator  
Cursor position data  
Range  
→12  
↓ 10  
B133°  
+
30  
R
T
40 m  
40°  
Interference rej. ON  
Target lock indicator  
25  
Transducer status  
indicator  
Own ship  
marker  
34° 12. 343' N  
Position in latitude  
and longitude*  
Course*, speed*  
134° 34. 213' W  
Train  
position  
CSE 357° SPD 9.9 kt  
PORT STBD  
Number of lines increases  
by one with each train.  
Top line is latest; bottom  
line is oldest.  
Color bar  
for strata  
display  
* Requires appropriate  
sensor input.  
Cursor  
-90°  
0°  
+90°  
Heading  
Horizontal Display  
(main window)  
Strata Display  
(sub window)  
Horizontal/Strata display  
The horizontal display appears in the main window; the strata display in the sub window.  
The strata picture shows bottom undulations in different colors. This is useful in bottom  
trawling for avoiding obstructions which may damage the net.  
Coverage for the horizontal mode is 360° picture, and for the strata display it is maximum  
90° from port to 90° starboard.  
The strata display may be adjusted with the [RANGE] and [SECTOR] controls. Press the  
[MAIN/SUB] key to choose the main or sub window. The message MAIN WINDOW  
CONTROLLABLE or SUB WINDOW CONTROLLABLE appears with each pressing of the  
key. A red rectangle circumscribes the sub window when it can be controlled.  
2-32  
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2. HORIZONTAL MODE  
◆
Color bar for the strata display  
The depth of the bottom each in all directions is displayed in the sub window, in the  
colors set by the color bar for the strata display. The color bar for the strata display  
shows search angle range below 336 degrees.  
Strongest  
color  
Weakest  
color  
90˚  
-90˚  
-12˚  
0˚  
12˚  
18  
-18˚  
-6˚  
6˚  
˚
The undulation of the bottom echo in all directions  
is shown by the colors on the color bar for the  
strata display.  
Color bar for  
strata display  
The position of the weakest echo can be changed with the [RANGE] control, and the  
width of each color on the color bar for the strata display with the [SECTOR] control. 25  
and 13 steps are available, respectively.  
Use the [SECTOR] control to  
adjust width of each color.  
Weakest color  
Use the [RANGE] control to move  
the location of the weakest echo color.  
Note: TILT, TRAIN, FULL/HALF, FAST SCAN, R/B, EVENT, TARGET, CUSTOM  
MODE controls may only be operated from the main window. When you  
attempt to operate them from the sub window the message “SELECT MAIN  
WINDOW.” appears for about four seconds.  
◆
Flat bottom and strata display  
Each layer on the strata  
display is equal to one  
train on the horizontal  
display.  
Color "a"  
on the color bar  
+90˚  
-90˚ PORT  
STBD  
When the bottom is flat  
the horizontal display  
inscribes the bottom as a  
true circle, and the strata  
display inscribes the color  
of point "a".  
Color "a"  
The color of this position  
on the color bar is the  
color of point "a" on the  
strata display.  
Flat bottom and strata display  
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2. HORIZONTAL MODE  
◆
Projection in fore direction and strata display  
Color "b" on the color bar  
is displayed here.  
+90˚  
-90˚ PORT  
STBD  
Color "a" on  
the color bar  
lor  
Projection in fore direction and strata display  
Depth gradually becoming shallower in fore direction and strata display  
◆
Color "b"  
STBD  
Color "c"  
-90˚ PORT  
+90˚  
Color "a"  
Color "b"  
Color "d"  
Color "a"  
Color "c"  
Depth gradually becoming shallower in fore direction and strata display  
◆
Depth gradually becoming deeper in fore direction and strata display  
a
c
d
c
Color "a"  
+90˚  
b
b
-90˚  
Color "b"  
Color "d"  
Color "a"  
Color "c"  
Depth gradually becoming deeper in fore direction and strata display  
2-34  
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3. VERTICAL SCAN MODE  
3.1 Operational Overview  
The figure below shows the typical vertical scan mode operating sequence.  
6. Set center bearing of train 8. Set tilt angle.  
sector.  
7(a). Set scanning sector.  
5. Set range.  
11. Adjust menu settings  
1. Turn on the power.  
9. Adjust gain.  
(ex. TVG) as required.  
2. Lower the transducer.  
10. Measure range and  
bearing to target with cursor.  
4. Select appropriate  
vertical scan mode.  
3. Adjust screen  
7(b). Select training sector 180˚.  
brilliance.  
Control unit  
3-1  
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3. VERTICAL SCAN MODE  
3.2 Displaying Vertical Scan Mode Display  
3.2.1 Typical vertical scan mode display  
Press the  
key to show the vertical scan mode display.  
Bearing indicator  
(Shows training direction.)  
FORE  
Bow  
Own  
ship  
PORT  
STARBOARD  
Training indicator  
(Trained at 190  
AFT  
Vertical range  
Horizontal range  
Transducer status indicator  
Interference  
Filled arrow: Respective action completed  
Blinking arrow: Action in progress  
rejector ON  
Heading*  
340  
Horizontal range scale  
Cursor  
position  
data  
+→6  
↓ 145  
R → 60 m  
↓
100 m  
FORE  
AFT  
60  
60  
34 12. 343' N  
Position in latitude  
and longitude*  
Fish echo  
Cursor  
134 34. 213' W  
CSE  
SPD  
357  
9.9 kt  
Course*, speed*  
Depth  
Horizontal  
range  
DEP  
TMP  
CUR  
GAIN  
35 m  
Bottom  
echo  
24  
63  
Water temperature*  
12.3 C  
Depth  
11.0  
2.0 kt  
Tide direction*,  
tide speed*  
Gain setting  
5.3  
TVG LEVEL 4.0  
DISTANCE 200 m  
COLOR  
TVG level,  
distance settings  
Range  
marker  
100  
Color bar  
* Requires appropriate  
sensor.  
Sector center  
indicator  
Vertical range scale  
Horizontal range marker  
Event marker  
Sweep indicator  
(Shows tilt angle  
in vertical scan mode.)  
Typical vertical scan mode display  
3-2  
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3. VERTICAL SCAN MODE  
3.2.2 How the vertical scan picture is painted  
The sounding beam is emitted and the information (target echoes) obtained by the  
reflected echo appears in the corresponding sector as it appears on the horizontal mode.  
The difference is that the training is performed only in vertical direction. It forms a  
sounding area of a half-circle (like a slice of watermelon) to observe a vertical section of  
underwater conditions.  
Note: The tilt mechanism has a 90° range of movement. To paint the full 180° area,  
therefore, the transducer is first trained through the left half (90-180°) of the area  
followed by the right half (0-90°). Approximately two seconds are required to rotate  
the transducer in the opposite direction before it begins training through the right or  
left half.  
Sounding Beam  
Screen Display  
(1) Bearing of the  
(1) Bearing of the  
sounding beam  
sounding beam  
0°  
BOW  
180°  
180
0°  
Sector center 90°.  
Display range  
24°.  
Tilting direction  
(2) Sector center  
(3) Display area  
ter,  
(3) Display area  
Select the bearing of the sounding beam (1) by [TRAIN]  
control, the sounding sector center (2) by the [TILT] con-  
trol and the display area (3) by the [SECTOR] control.  
How the vertical scan mode picture is painted  
3-3  
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3. VERTICAL SCAN MODE  
3.2.3 Horizontal/vertical scan display  
Press the  
key to display the horizontal/vertical scan display.  
Tilt angle  
Cursor position  
data  
Vertical scan  
bearing cursor  
Tilt angle indicator  
Range  
→17  
R
T
40 m  
40  
30  
↓ 14  
B156  
+
Interference rejector  
ON  
25  
Target lock indicator  
Transducer status indicator  
Own ship  
marker  
34 12. 343' N  
134 34. 213' W  
Position in latitude,  
and longitude*  
Course*, speed*  
Train  
position  
CSE 357  
AFT  
SPD 9.9 KT  
FORE  
* Requires navigator.  
Sweep indicator  
(tilt angle)  
Cursor  
100  
Vertical Scan Display  
(sub window)  
Horizontal Display  
(main window)  
Horizontal/vertical scan display  
The size of the vertical scan and horizontal displays and the location of the vertical scan  
display may be changed as desired. Press the  
the figure below.  
key to change the arrangement as in  
3-4  
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3. VERTICAL SCAN MODE  
The displays are independent of each other so you can adjust them as desired. Press the  
[MAIN/SUB] key to choose the window to adjust. Each press of the key momentarily  
displays MAIN WINDOW CONTROLLABLE or SUB WINDOW CONTROLLABLE at the  
top of the screen to let you know which window may be adjusted. A red rectangle  
circumscribes the sub window when it is selected. The following controls are operative  
from either window: SECTOR, TRAIN, RANGE, TILT, FAST SCAN, FULL/HALF and  
CUSTOM MODE.  
Note: R/B, EVENT or TARGET controls may only be operated from the main window.  
When you attempt to operate them when the sub window is selected the message  
SELECT MAIN WINDOW appears.  
TRAIN control  
For horizontal display: Sets training center direction.  
For vertical scan display: Sets direction of bearing cursor shown on the horizontal mode  
display.  
SECTOR control  
For the vertical scan display: When the display sector is 6° (minimum), the tilt angle of  
the horizontal and vertical scan modes are interlocked and each transmission on the  
horizontal display is reflected on the vertical scan display. The message TILT ANGLE  
MONITOR WINDOW momentarily appears on the screen and the vertical bearing cursor  
disappears.  
Note: Only the [SECTOR] control may be operated in this condition.  
.
3-5  
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3. VERTICAL SCAN MODE  
3.3 Choosing the Range  
The [RANGE] control chooses the detection (display) range, in 15 settings. Choose the  
range according to either the fish species being searched or the depth desired. Each time  
the control is operated the newly chosen range briefly appears in large characters at the  
screen top. Range is permanently displayed at the top right-hand corner of the screen.  
Default vertical scan mode range settings  
Unit  
Meters 10  
Feet 30  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
20  
60  
30  
90  
40  
120  
60  
150  
80  
100 120 160 200 250 300 400  
500  
600  
200 250 300 400 500 600 800 1000 1500 2000  
Note 1: Unit of range measurement may be chosen from among meters, feet, fathoms,  
passi/braza and Hiro (Japanese) with UNIT on the SYSTEM SETTING 1 menu.  
For further details, see UNIT in paragraph 5.4.2.  
Note 2: Ranges may be freely preset as desired. For further details, see paragraph 5.4.5.  
3.4 Choosing Train Center  
The [TRAIN] control determines the bearing of the vertical scan beam, from 0° to 180°.  
Bearing of beam position can be found by observing the train indicator.  
0 (360 ) → 6 → 12 → 18 → ... 180  
Train Indicator  
Train indicator  
Train of Vertical Scan Beam  
Bow  
TRAIN  
Train indicator  
Train 0  
Train 90  
Train 180  
FORE  
AFT  
STBD  
Train indicator and display  
3-6  
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3. VERTICAL SCAN MODE  
3.5 Choosing Display Sector  
Sector means the width of the transducer training, from 6° to 180°.  
Sector (Shown: 24 )  
24  
Sector  
The [SECTOR] control chooses the training area among the sixteen positions shown in  
the table below. Clockwise rotation of the control increases the sector width;  
counterclockwise rotation decreases it.  
1
6
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
Sector  
width  
(°)  
12  
24  
36  
48  
60  
72  
84  
96 108 120 132 144 156 168 180  
One-touch selection of 180° sector  
1. Press the [FULL/HALF] key. A half-circle display of 180° is presented, and “FULL”  
momentarily appears at the top of the display.  
2. Press the [FULL/HALF] key again, and a 120°-sector display is presented, and  
120° momentarily appears at the top of the display.  
Note: Operating the [SECTOR] control after step 1 in the procedure above will display the  
180° sector at the next pressing of the [FULL/HALF] key.  
Sector set with  
SECTOR control  
Half circle  
FULL/HALF  
key  
0
0
180  
180  
FULL/HALF  
key  
180  
120  
24  
How the FULL/HALF key works  
3-7  
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3. VERTICAL SCAN MODE  
3.6 Choosing Sector Center  
The center direction of the sounding beam in the vertical direction can be changed with  
the [TILT] control. The setting range is 0° to 180° in increments of 6°. Choose the setting  
which places the sector center in the middle of the detection range.  
Sector center angle  
set with TILT control  
In the example display at left, the sector  
center indicator is starboard, and the  
width of the sector is 48 .  
PORT  
STBD  
0
Sector  
range  
180  
Sector center  
indicator  
Sector of 48 set with  
[SECTOR] control  
Sector center  
Automatic shifting of own ship position  
Own ship position on the screen is automatically shifted either rightward or leftward  
according to the direction of the sector center and display sector width.  
The figure below shows the own ship position has been shifted rightward on the screen to  
provide the wider view at the port side.  
Sector center 0° to 60°:  
Sector center 66° to 114°:  
Own ship position shifted to port side  
Own ship position shifted to center  
Sector center 120° to 180°: Own ship position shifted starboard  
Display sector  
Sector center  
How automatic shifting works  
3-8  
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3. VERTICAL SCAN MODE  
3.7 Choosing the Tilt Speed  
The [FAST SCAN] key chooses the tilt speed; that is, the stepping angle at which the  
transducer scans. Two choices are available, 3° (normal speed) and 6° (high speed). Each  
time the key is pressed the display momentarily shows “NORM” (normal speed) or “FAST”  
(high speed).  
Normal: 60 transmissions to complete a half circle, in increments of 3°.  
High: 30 transmissions to complete a half circle, in increments of 6°.  
The time required to scan one full area of 180° depends on range used and other factors.  
The table below shows the time required to complete one full area on each range.  
Ranges  
Unit  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
ft  
30  
60  
90  
120  
150  
200  
250  
300  
400  
500  
600  
800  
1000 1500 2000  
Time  
Norm  
13  
9
13  
9
13  
9
13  
9
13  
9
13  
9
13  
9
13  
9
15  
9
17  
10  
20  
11  
26  
14  
31  
17  
46  
24  
60  
31  
required  
(sec) for  
one full  
Fast  
180°  
area  
Unit  
m
10  
13  
20  
13  
30  
13  
40  
13  
60  
13  
80  
13  
100  
13  
120  
14  
160  
18  
200  
22  
250  
27  
300  
31  
400  
41  
500  
50  
600  
59  
Time  
Norm  
required  
(sec) for  
one full  
Fast  
9
9
9
9
9
9
9
9
10  
12  
15  
17  
22  
27  
31  
180°  
area  
Note: Values shown are for reference purposes. Actual values may vary.  
3.8 Finding Echo Position with the Cursor  
The cursor measures horizontal range and depth. Operate the Omnipad to place the  
cursor where desired. Cursor data appears at the top left-hand corner on the screen.  
Cursor data  
+→ : Horizontal range  
↓: Depth  
NAV  
DATA  
Cursor  
Location of cursor position data  
3-9  
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3. VERTICAL SCAN MODE  
3.9 Event Marker  
3.9.1 Entering an event marker  
The event marker functions to mark important locations on the screen, and five may be  
inscribed. Each time the [EVENT] key is pressed the “latest event marker” (⊕) is inscribed  
at the cursor location and all previously entered event markers are shown by the “previous  
event marker” (+). When the capacity for event markers is reached, the eldest event  
marker is erased from the screen to make room for the latest.  
Note 1: The latitude and longitude position of the event marker can be output to a video  
plotter and that position inscribed on the plotter’s screen with the external  
waypoint mark (X). Each press of the [EVENT] key outputs event marker position.  
For further details, see TARGET L/L in paragraph 5.4.2.  
Note 2: Event markers cannot be inscribed in the vertical scan display when it is in the  
sub window (Horizontal/vertical scan display). Inscribe the marker on the  
horizontal display to show it in the vertical scan display.  
1. Operate the Omnipad to place the cursor on the location desired for an event marker.  
2. Press the [EVENT] key to inscribe the event marker. The event marker is inscribed on  
the vertical scan display, as well as the horizontal and video plotter displays.  
Display area  
"Previous event  
marker"  
NAV  
DATA  
"Latest event marker"  
To delete all event markers,  
place cursor outside  
display area and press the  
[MENU] key.  
How to inscribe and delete the event markers  
3-10  
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3. VERTICAL SCAN MODE  
3.9.2 Deleting all event markers  
All event markers can be erased from the screen as follows:  
1. Operate the Omnipad to place the cursor outside the display area.  
2. Press the [EVENT] key to show the following dialog box. Do the next step within four  
seconds; otherwise the dialog box will be erased.  
DELETE EVENT MARK?  
NO YES  
3. Press ► to choose YES and then press the [MENU] key. All event markers are erased  
from the screen.  
3.10 Depth and Horizontal Range Markers  
The depth and horizontal range markers function to measure the horizontal range and  
depth to a desired echo.  
Note: Depth and horizontal range markers cannot be inscribed on the vertical scan  
display when it is in the sub window (Horizontal/vertical scan display). Inscribe the  
markers on the horizontal display to show them in the vertical scan display.  
1. Operate the Omnipad to place the cursor on the location desired.  
2. Press the [R/B] key to display the depth and horizontal range markers. Horizontal  
range and depth appear on the screen.  
3. To erase the depth and horizontal range markers, place the cursor on the intersecting  
point of the depth and horizontal range markers or outside the display and then press  
the [R/B] key.  
Horizontal range  
marker  
NAV  
DATA  
Horizontal range  
94  
105  
Depth  
Depth marker  
Depth and horizontal range markers  
3-11  
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3. VERTICAL SCAN MODE  
3.11 Adjusting the Picture  
3.11.1 Displaying weak echoes clearly  
Echoes from targets (such as the bottom or a fish) return to the transducer in order of the  
distance to them, and when their intensities are compared at the transducer face, those  
from nearer targets are generally stronger when their reflecting properties are nearly equal.  
The sonar operator will be quite inconvenienced if these echoes are directly displayed on  
the screen, since he won’t be able to judge the actual size of the target from the size of  
echoes displayed on the screen. To overcome this inconvenience, use the TVG function. It  
compensates for propagation loss of sound in water: amplification of echoes on short  
range is suppressed and gradually increased as range increases, so that similar targets  
are displayed in similar intensities irrespective of the ranges to them.  
The TVG also functions to suppress unwanted echoes and noise which appear in a certain  
range area on the screen.  
To adjust TVG:  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ or ► to choose the VERT menu.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
TVG LEVEL  
4.0  
4.0  
0
TVG DISTANCE  
GAIN ADJUST  
RES. COLOR  
CLUTTER  
LOG  
0
HORZ RANGE  
x1  
: CHANGE  
MENU: END  
: SELECT  
VERT menu  
3. Press ▲ or ▼ to choose TVG DISTANCE and then press ► to show the following  
dialog box.  
TVG DISTANCE  
4.0  
GAIN  
Hi  
Lo  
200m  
3-12  
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3. VERTICAL SCAN MODE  
4. Press ◄ or ► to adjust TVG distance, considering sea conditions. The larger the figure  
the greater the distance at which the TVG works.  
TVG  
Distance  
Setting  
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0  
. . . .  
. . . .  
10.0  
Meters  
3
8
20  
70  
10  
10  
40  
60  
100 130 160 200 250 320  
1000  
3280  
600  
Feet  
10  
2
30  
5
130 210 330 410 520 660 820 1040  
Passi/braza  
Fathoms  
20  
20  
40  
40  
60  
60  
80  
80  
100 120 150 180  
100 110 140 170  
２
5
550  
5. Press ▲ or ▼ to close the dialog box and return to the VERT menu.  
6. To suppress reflections from the sea surface or plankton, choose TVG LEVEL and then  
press ►.  
7. Press ◄ or ► to adjust TVG LEVEL, considering sea conditions. The larger the figure  
the less the gain over distance.  
8. Press the [MENU] key to register your selection and close the menu.  
Wrong  
Correct  
Level too high  
Distance too high  
Examples of proper and improper TVG  
3-13  
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3. VERTICAL SCAN MODE  
3.11.2 Suppressing noise and interference  
You may encounter occasional or intermittent noise and interference as shown below. This  
is mostly caused by electrical equipment, engine, propeller noise from own ship, or noise  
from other sonars being operated nearby. If interference appears, turn on the interference  
rejector as below to suppress it.  
Interference rejector ON  
Interference  
(In this display,  
interference shows  
itself every 6 .)  
Appearance of interference  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the COM1 menu.  
4. Press ▲ or ▼ to choose INT REJECT.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to choose OFF or ON as appropriate.  
7. Press the [MENU] key to register your selection and close the menu.  
3.11.3 Gain adjustment  
Adjust the gain here when there is disparity in gain level between the main and sub  
windows.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the VERT menu.  
4. Press ▲ or ▼ to choose GAIN ADJUST.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to adjust.  
7. Press the [MENU] key to register your selection and close the menu.  
3-14  
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3. VERTICAL SCAN MODE  
3.11.4 Resolution color  
RES. COLOR sets transfer characteristics of input signal level versus display echo level.  
Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG. You can see the  
characteristics of each by watching the color bar as you change the setting.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the VERT menu.  
4. Press ▲ or ▼ to choose RES. COLOR.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to choose appropriate option, referring to the description below.  
LOG:  
Displays weak to strong echoes in their respective levels. This setting is  
suitable for general use.  
LINEAR: Downplays the weak echoes when compared with LOG. Effective for  
suppressing weak echoes such as plankton.  
SQUARE: Strong echoes are emphasized more than in LINEAR.  
CUBE:  
Strong echoes are emphasized even more than in SQUARE.  
7. Press the [MENU] key to register your selection and close the menu.  
3.11.5 Suppressing clutter  
Low intensity echoes, often caused by sediments in water, are painted on the screen as a  
large number or random dots. This noise can be suppressed.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the VERT menu.  
4. Press ▲ or ▼ to choose CLUTTER.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to choose 0, 1, 2 or 3 as appropriate. The higher the number (setting)  
the weaker the echoes which are erased.  
7. Press the [MENU] key to register your selection and close the menu.  
3-15  
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3. VERTICAL SCAN MODE  
3.11.6 Choosing horizontal range expansion factor  
You may choose the horizontal range expansion factor for the vertical scan picture, from  
x1 or x2. Note that this feature cannot be adjusted when the vertical search mode,  
activated by a function key, is turned on.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the VERT menu.  
4. Press ▲ or ▼ to choose HORZ RANGE.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to choose x1 or x2 as appropriate.  
7. Press the [MENU] key to register your selection and close the menu.  
3-16  
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3. VERTICAL SCAN MODE  
3.12 Interpreting the Vertical Scan Display  
This section provides information necessary for interpreting the vertical scan display.  
3.12.1 Sample echo displays  
Port-starboard picture  
You can see fish echoes at the center-right of the screen. The bottom is displayed wider  
as the distance from the ship’s position increases. Therefore, it may be difficult to  
discriminate bottom fish.  
Own ship  
STBD  
PORT  
Fish  
school  
Bottom  
Port-starboard picture  
When ship passes over fish schools  
The sounding beam is directed fore-aft and the display is off-centered* to present a wider  
view of the area forward of the ship. You can clearly see fish schools approaching from the  
bow of the ship.  
*: Automatically off-centered.  
Own ship  
AFT  
Forward  
FORE  
Fish  
school  
AFT  
FORE  
Fish  
school  
Picture appearance when passing over fish schools  
3-17  
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3. VERTICAL SCAN MODE  
Display of net hauling  
This is an example of net hauling display. The location of the net is indicated clearly.  
FORE  
AFT  
Net  
Net hauling and sonar picture  
False echo  
In shallow water (depth less than 100 m) detection, unwanted echoes as shown in the  
figure below may appear. This phenomenon is caused by the false echo from the previous  
transmission. Reducing the Tx rate on the COM1 menu may lessen this effect.  
PORT  
STBD  
False echo  
Fish  
Bottom  
Range  
False echoes  
3-18  
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4. ECHO SOUNDER MODE  
4.1 Operational Overview  
The figure below shows the typical echo sounder mode operating sequence.  
8. Set tilt angle.  
7. Select display sector.  
1. Turn on the power.  
5. Set range.  
11. Adjust menu settings  
(turn on A-scope  
display, etc.).  
6. Adjust gain.  
2. Lower the transducer.  
10. Measure range to fish  
school with cursor.  
4. Select echo sounder  
mode.  
3. Adjust screen  
9. Set picture advance speed.  
brilliance.  
Control unit  
4-1  
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4. ECHO SOUNDER MODE  
4.2 Typical Echo Sounder Display  
Press the  
key to display the echo sounder picture.  
Tilt angle indicator  
Bearing  
(Shows tilt angle of transducer.)  
indicator  
(Shows train  
direction.)  
Interference  
rejector ON  
Tilt angle  
Range  
Heading  
Transducer status indication  
Cursor  
position  
R 10 m  
T
60°  
+
↓ 4  
340°  
Minute marker  
Fish echo  
34° 12. 343' N  
134° 34. 213' W  
Position in latitude*,  
longitude*  
CSE  
SPD  
357˚  
9.9 kt  
Course*, speed*  
Cursor  
CUR  
11.0˚  
2.0 kt  
Tide direction*,  
tide speed*  
5
Range  
5
GAIN  
5.3  
Gain setting  
Bottom echo  
TVG LEVEL 4.0  
TVG level,  
distance settings  
DISTANCE 200 m  
Color bar  
10  
TMP 12. 3˚C  
DEP  
* Requires appropriate  
sensor.  
6.5 m  
Depth  
Water  
temperature*  
Range marker  
(When the tilt angle  
is 90 deg., the depth  
measured by this  
sonar is displayed  
inside a rectangle.)  
Range scale  
Event marker  
Typical echo sounder display  
4-2  
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4. ECHO SOUNDER MODE  
4.3 Choosing the Range  
The [RANGE] control chooses the detection (display) range, in 15 settings. Choose the  
range according to either the fish species being searched or the depth desired. Each time  
the control is operated the newly chosen range briefly appears in large characters at the  
screen top. Range is permanently displayed at the top right-hand corner.  
Normally the range is set so that the bottom is traced at the lower part of the screen.  
Range concept  
Default echo sounder mode range settings  
Unit  
Meters 10 20 30 40  
Feet  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
60  
80  
100 120 160 200 250 300 400  
500  
600  
30 60 90 120 150 200 250 300 400 500 600 800 1000 1500 2000  
Note 1: Unit of range measurement may be chosen from among meters, feet, fathoms,  
passi/braza and Hiro (Japanese). For further details, see UNIT in paragraph 5.4.2.  
Note 2: Ranges may be freely preset as desired. For further details, see paragraph 5.4.6.  
4-3  
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4. ECHO SOUNDER MODE  
4.4 Train Direction  
The sounding beam may be directed 360° in any direction. Operate the [TRAIN] control to  
choose sounding beam direction. Each setting on the control is an increment of 6°. The  
train indicator at the top of the screen shows training direction: 0°, fore direction; 90°,  
starboard direction; 180°, aft direction, and 270°, port direction.  
0 (360 ) → 6 → 12 → 18 → ... 354  
Train 0  
Train 90  
Train 180  
Train 270  
Train indicator and display  
4.5 Choosing Tilt Angle  
The transducer can be pointed directly toward the bottom or forward of the ship. Operate  
the [TILT] control to choose an appropriate tilt angle. The available tilt angle is 0° (horizontal  
direction) to 90° (vertical), in increments of 1°. Chosen tilt angle appears at the top of the  
display to the right of “T”.  
4.6 Choosing Picture Advance Speed  
The picture advance speed determines how quickly the vertical scan lines run across the  
screen, from right to left. When choosing a picture speed, keep in mind that a fast advance  
speed will expand a fish school horizontally on the screen and a slow one will contract it.  
1. Press the [FAST SCAN] key. The following dialog box appears. Do the next step within  
four seconds; otherwise the dialog box will be erased.  
ADVANCE  
1/8 1/4 1/2 1/1 2/1  
2. Press ◄ or ► ([FAST SCAN] key may also be used) to choose a speed. The fractions  
in the dialog box correspond to the number of scan lines produced per transmission. For  
example, “2/1” means two scan lines are produced per transmission.  
3. Press the [MENU] key to close the dialog box. Note that the dialog box is automatically  
closed if there is no control operation for about four seconds.  
4-4  
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4. ECHO SOUNDER MODE  
4.7 Measuring Range by Cursor  
Use the cursor to display the range from own ship to the cursor location. Use the Omnipad  
to place the cursor where desired. The range to the cursor appears at the upper left-hand  
corner of the screen.  
Range to cursor  
↓ : Range  
NAV  
DATA  
or  
A-SCOPE  
DISPLAY  
Cursor  
How to measure range with the cursor  
4.8 Event Marker  
The event marker functions to mark important locations on the screen, and five may be  
inscribed. Each time the [EVENT] key is pressed the “latest event marker” (⊕) is inscribed at  
the cursor location and all previously entered event markers are shown by the “previous  
event marker” (+). When the capacity for event markers is reached, the eldest event marker  
is erased from the screen to make room for the latest.  
Note 1: The event marker inscribed on the echo sounder display will also be inscribed on  
the horizontal and video plotter displays. However, the marker is always inscribed  
at own ship position on the horizontal and video plotter displays regardless of the  
location of the marker on the echo sounder display.  
Note 2: The latitude and longitude position of the event marker can be output to a video  
plotter and that position inscribed on the plotter’s screen with the external waypoint  
mark (X). Each press of the [EVENT] key outputs event marker position. For further  
details, see TARGET L/L in paragraph 5.4.2.  
Note 3: Event markers are automatically erased as they move off the screen with picture  
advancement. However, event marks entered from the echo sounder remain on the  
horizontal and video plotter displays, until they are erased.  
4-5  
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4. ECHO SOUNDER MODE  
4.8.1 Inscribing the event marker  
1. Operate the Omnipad to place the cursor on the location desired for an event marker.  
2. Press the [EVENT] key to inscribe the event marker.  
Display area  
"Previous event marker"  
NAV  
DATA  
or  
A-SCOPE  
DISPLAY  
"Latest event marker"  
To delete all event markers,  
place the cursor outside  
the display area and  
press the [EVENT] key.  
How to inscribe and delete the event markers  
4.8.2 Deleting all event markers  
All event markers can be erased from the screen as follows:  
1. Operate the Omnipad to place the cursor outside the display area.  
2. Press the [EVENT] key to show the following dialog box. Do the next step within four  
seconds; otherwise the dialog box will be erased.  
DELETE EVENT MARK?  
NO YES  
3. Press ► to choose YES and then press the [MENU] key. All event markers are erased  
from the screen.  
4-6  
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4. ECHO SOUNDER MODE  
4.9 Range Marker  
The range marker functions to measure the range to a target echo (fish school, bottom,  
etc.)  
1. Operate the Omnipad to place the cursor on the location desired.  
2. Press the [R/B] key to display the range marker. The range marker appears along with  
range indication.  
3. To erase the range marker, place the cursor on the marker or outside the display area  
and then press the [R/B] key.  
Range marker  
NAV  
DATA  
or  
Range  
67  
A-SCOPE  
DISPLAY  
Range marker  
4-7  
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4. ECHO SOUNDER MODE  
4.10 Adjusting the Picture  
4.10.1 Displaying weak echoes clearly  
Echoes from targets (such as the bottom or a fish) return to the transducer in order of the  
distance to them, and when their intensities are compared at the transducer face, those  
from nearer targets are generally stronger when their reflecting properties are nearly equal.  
The sonar operator will be quite inconvenienced if these echoes are directly displayed on  
the screen, since he won’t be able to judge the actual size of the target from the size of  
echoes displayed on the screen. To overcome this inconvenience, use the TVG function. It  
compensates for propagation loss of sound in water: amplification of echoes on short range  
is suppressed and gradually increased as range increases, so that similar targets are  
displayed in similar intensities irrespective of the ranges to them.  
The TVG also functions to suppress unwanted echoes and noise which appear in a certain  
range area on the screen.  
To adjust TVG:  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU and then press ◄ or ► to choose the ES menu.  
MENU  
TVG LEVEL  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
4.0  
4.0  
0
TVG DISTANCE  
GAIN ADJUST  
RES. COLOR  
CLUTTER  
LOG  
0
A-SCOPE  
OFF  
: SELECT  
: CHANGE  
MENU: END  
ES menu  
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4. ECHO SOUNDER MODE  
3. Press ▲ or ▼ to choose TVG DISTANCE and then press ►. The following dialog box  
appears.  
TVG DISTANCE  
4.0  
GAIN  
Hi  
Lo  
200 m  
4. Press ◄ or ► to adjust TVG distance.  
TVG  
Distance  
Setting  
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0  
. . . .  
. . . .  
10.0  
Meters  
3
8
20  
70  
10  
10  
40  
60  
100 130 160 200 250 320  
1000  
3280  
600  
Feet  
10  
2
30  
5
130 210 330 410 520 660 820 1040  
Passi/braza  
Fathoms  
20  
20  
40  
40  
60  
60  
80  
80  
100 120 150 180  
100 110 140 170  
２
5
550  
5. Press ▲ or ▼ to close the dialog box and return to the ES menu.  
6. To suppress reflections from the sea surface or plankton, choose TVG LEVEL and then  
press ►.  
7. Press ◄ or ► to adjust TVG LEVEL.  
8. Press the [MENU] key to register your selection and close the menu.  
4-9  
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4. ECHO SOUNDER MODE  
4.10.2 Finding echo strength (A-scope display)  
The A-scope display shows echoes at each transmission with amplitudes and tone  
proportional to their intensities, on the right 1/4 of the screen. It is useful for estimating the  
kind of fish school and bottom composition.  
1. Press the [MENU] key.  
2. Press ▲ to choose MENU.  
3. Press ◄ or ► to choose ES.  
4. Press ▼ to choose A-SCOPE.  
5. Press ◄ or ► to open the dialog box.  
A-SCOPE  
OFF  
ON  
6. Press ► to choose ON.  
7. Press the [MENU] key to close the dialog box.  
Echo sounder display  
A-scope display  
Depth, water temp. display  
A-scope display  
4-10  
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4. ECHO SOUNDER MODE  
4.10.3 Gain adjustment  
Adjust the gain here when there is disparity in gain level between the main and sub  
windows.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the ES menu.  
4. Press ▲ or ▼ to choose GAIN ADJUST.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to adjust.  
7. Press the [MENU] key to register your selection and close the menu.  
4.10.4 Resolution color  
RES. COLOR sets transfer characteristics of input signal level versus display echo level.  
Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG. You can see the  
characteristics of each by watching the color bar as you change the setting.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the ES menu.  
4. Press ▲ or ▼ to choose RES. COLOR.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to choose appropriate option, referring to the description below.  
LOG:  
Displays weak to strong echoes in their respective levels. This setting is  
suitable for general use.  
LINEAR: Downplays the weak echoes when compared with LOG. Effective for  
suppressing weak echoes such as plankton.  
SQUARE: Strong echoes are emphasized more than in LINEAR.  
CUBE:  
Strong echoes are emphasized even more than in SQUARE.  
7. Press the [MENU] key to register your selection and close the menu.  
4-11  
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4. ECHO SOUNDER MODE  
4.10.5 Suppressing clutter  
Low intensity echoes, often caused by sediments in water, are painted on the screen as a  
large number or random dots. This noise can be suppressed.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU at the top of the screen.  
3. Press ◄ or ► to choose the ES menu.  
4. Press ▲ or ▼ to choose CLUTTER.  
5. Press ► to open the dialog box.  
6. Press ◄ or ► to choose 0, 1, 2 or 3 as appropriate. The higher the number (setting) the  
weaker the echoes which are erased.  
7. Press the [MENU] key to register your selection and close the menu.  
4-12  
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5. MENU OPERATION  
5.1 COM1 Menu  
5.1.1 Displaying the COM1 menu  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU, and then press ◄ to choose COM1.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
TX POWER  
PULSELENGTH  
TX RATE  
MAX  
LONG  
10  
INT REJECT  
AGC  
OFF  
OFF  
0
AUDIO LEVEL  
: CHANGE  
MENU: END  
: SELECT  
COM1 menu  
5.1.2 COM1 menu description  
TX POWER: Chooses transmitter output power to maximum or minimum. For further  
details, see paragraph 2.11.1.  
PULSELENGTH: Chooses pulselength to short or long. For further details, see  
paragraph 2.11.2.  
TX RATE: The Tx rate may be set between 1-10 in the case of the internal transmitter, or  
an external synchronous signal may be used. The higher the number the greater the  
number of transmissions. For operation in shallow waters, choose the Tx rate which  
displays the second reflection from the bottom between the sea surface and bottom. For  
use of an external video sounder or sonar, choose EXT.  
INT REJECT: Turns the interference rejector on or off. For further details, see paragraph  
3.11.2.  
AGC: Automatically lowers sensitivity against strong echoes (such as those from the  
bottom and large fish schools) to emphasize weak echoes such as those from fish close  
to the bottom.  
AUDIO LEVEL: Adjust the volume of the optional speaker.  
5-1  
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5. MENU OPERATION  
5.2 COM2 Menu  
5.2.1 Displaying the COM2 menu  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU, and then press ◄ or ► to choose COM2.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
DELETING TRACK  
WHITE MARKER  
SIG LEVEL  
NO  
OFF  
OFF  
16  
COLOR  
BKGD COLOR  
2
: CHANGE  
MENU: END  
: SELECT  
COM2 menu  
5.2.2 COM2 menu description  
DELETING TRACK: Choose ON to delete all ship’s track (from horizontal and  
horizontal/video plotter displays).  
WHITE MARKER: Displays desired echo in white. It is useful for discriminating bottom  
fish from the bottom echo. The setting range for the 8-color display is OFF, 1-7, and for  
the 16-color display, OFF, 1-15.  
SIG LEVEL: Refer to page 2-17.  
COLOR: Chooses 8- or 16-color display.  
BKGD COLOR: Chooses color of background, text and menu. Three choices are  
available and these are shown in the table below.  
BKGD COLOR Background  
Text  
Gray  
Menu  
Dark-blue  
Medium blue  
Gray  
1
2
3
Black  
Dark-blue  
White  
White  
Black  
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5. MENU OPERATION  
5.3 Short-cut Menu, Preset Menu  
These menus program the CUSTOM MODE keys [1], [2] and [3]. The menu to use may  
be chosen with CUSTOM KEY on the SYSTEM SETTING 1 menu.  
Short-cut key: One-touch activation of the operator-selected dialog box.  
Preset key: One-touch setup of mode, sector, train, range, tilt and scan speed. Below  
are the default settings for PRESET.  
Custom mode key default settings for PRESET  
CUSTOM MODE key  
Display Mode  
Horizontal  
Expansion  
Sector  
Train Range (m) Tilt  
Speed  
Key 1  
240°  
0°  
160  
30°  
Fast  
Key 2  
Key 3  
Horizontal  
360°  
180°  
0°  
160  
120  
30°  
90°  
Fast  
Fast  
Vertical Scan  
90°  
5.3.1 Choosing short-cut or preset  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU, and then press ► to choose SYS.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
GO TO SYS MENU  
YES  
NO  
: SELECT  
MENU: END  
: CHANGE  
Display for opening system menu  
3. Press ▼ to choose GO TO SYS MENU.  
4. Press ◄ to choose YES.  
5-3  
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5. MENU OPERATION  
** SYSTEM MENU **  
SYSTEM SETTING:  
RANGE-SONAR MODE  
RANGE-VERTICAL MODE  
RANGE-E/S MODE  
RANGE-TRACK MODE  
COLOR PALETTE  
LANGUAGE  
SYSTEM BACKUP  
LOAD BACKUP DATA  
HEADING OFFSET, DRAFT OFFSET  
ADJ MOTION SENSOR  
TX FREQ ADJUST  
TEST  
TEST PATTERN  
DEMO MODE  
DEFAULT  
: SELECT  
: MENU DISPLAY MENU: END  
System menu  
5. SYSTEM SETTING is highlighted; press ► to open the SYSTEM SETTING menu.  
** SYSTEM SETTING 1 **  
MENU  
1
2
POSITION  
: SHIP'S L/L SHIP'S LOP CURSOR L/L  
TRACK  
: OFF  
ON  
OFF  
TRUE  
OFF  
NAV  
GPS  
OFF  
FLOW FROM  
FLOW TO  
CURRENT DATA  
:
AZ  
HEADING INDICATION :  
ON  
NORTH MARK  
CSE DATA  
:
:
:
:
:
GYRO  
LoranC LoranA DR DECCA OTHERS  
NAV DATA  
1/2  
1/1  
fa  
TVG CORRECTION  
m
ft  
HIRO P/B  
UNIT  
:
C
F
TEMP  
OFF  
ON  
TARGET L/L  
CUSTOM KEY  
EMPHASIS MODE  
:
:
:
PRESET KEY SHORT-CUT KEY  
OFF  
OFF  
NORMAL RED  
10sec 30sec 1min 3min  
6min  
ETA MARK  
:
: CHANGE  
MENU: END  
: SELECT  
System setting 1 menu  
6. Press ▲ or ▼ to choose CUSTOM KEY.  
7. Press ◄ or ► to choose PRESET KEY or SHORT-CUT KEY as desired.  
8. Press the [MENU] key twice to register your selection and close the menu.  
5-4  
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5. MENU OPERATION  
5.3.2 Changing setting of preset key  
1. Choose PRESET KEY following the procedure in paragraph 5.3.1.  
2. Press the [MENU] key to open the menu.  
3. Press ▲ to choose MENU, and then press ◄ or ► to choose PRESET.  
MENU  
COM1 COM2 HORZ VERT ES PRESET  
SYS  
MODE  
SECTOR  
360  
TRAIN  
0
RANGE  
160  
TILT  
30  
SPEED  
NORM  
FAST  
FAST  
FAST  
PRESENT  
1
240  
360  
180  
0
0
160  
160  
120  
30  
30  
90  
90  
ADJUST THE KNOBS AND FUNCTION KEYS TO THE DESIRED SETTING,  
THEN PRESS A CUSTOM MODE KEY TO SAVE THE SETTING.  
FUNCTION KEY: ENTRY MENU: END  
PRESET menu  
4. Set the [MODE], [SECTOR], [TRAIN], [RANGE], [TILT] and [FAST SCAN] controls  
according to target fish or fishing area. Current setting is shown in the “PRESENT”  
section.  
5. Press the CUSTOM MODE keys [1], [2] or [3] as appropriate to program. You are  
asked if you want to save the settings to the custom key pressed. (In the example  
below the custom key [1] was pressed.)  
SAVE THE SETTINGS TO CUSTOM1 KEY?  
NO  
YES  
: CHANGE  
MENU: END  
6. Press ► to choose YES.  
7. Press the [MENU] key. The message “PRGM SET” appears at the screen top.  
8. Press the [MENU] key to finish.  
Activating a custom mode key  
1. Press appropriate CUSTOM MODE key. The indication CUSTOM1, CUSTOM2 or  
CUSTOM3 appears at the top of the screen depending on key pressed.  
2. To escape from the custom mode operation, operate any of the following controls:  
[MODE], [SECTOR], [TRAIN], [RANGE], [TILT] or [FAST SCAN].  
5-5  
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5. MENU OPERATION  
5.3.3 Changing setting of short-cut key  
The default settings are key [1], vertical search; key [2], volume, and key [3], delete track.  
The operator may change their functions as desired.  
Note: In the combination modes the short-cut key may only be activated from the main  
window.  
1. Choose SHORT-CUT following the procedure in paragraph 5.3.1.  
2. Press the [MENU] key to open the menu.  
3. Press ▲ to choose MENU, and then press ◄ or ► to choose SHORT-CUT.  
SHORT-CUT  
SYS  
MENU  
COM1 COM2 HORZ VERT ES  
VER SEARCH VOLUME DEL TRACK AUTO TILT BKGD  
SIG LEVEL CLUTTER RES. COLOR WHITE MARKER  
VER SEARCH VOLUME DEL TRACK AUTO TILT BKGD  
SIG LEVEL CLUTTER RES. COLOR WHITE MARKER  
VER SEARCH VOLUME DEL TRACK AUTO TILT BKGD  
SIG LEVEL CLUTTER RES. COLOR WHITE MARKER  
KEY 1  
KEY 2  
KEY 3  
SELECT FUNCTION TO BE ALLOCATED TO EACH CUSTOM KEY.  
CUSTOM KEY MAY BE USED AS A PRESET KEY.  
: SELECT  
: CHANGE  
MENU: END  
SHORT-CUT menu  
4. Press ▲ or ▼ to choose key to preset. For example, choose KEY 1.  
5. Press ◄ or ► to choose item.  
Item  
VER.  
Description  
See description on the next page.  
Ref. Paragraph  
SEARCH  
Note: HORZ RANGE on the VERT MENU cannot  
be adjusted when vertical search is active. Beeps  
sounds if you attempt to adjust the setting.  
Adjust audio level of optional speaker.  
VOLUME  
5.1.1  
5.2.1  
DEL. TRACK Delete track from the horizontal and  
horizontal/video plotter displays.  
AUTO TILT  
BKGD  
Turn automatic tilt on or off.  
Choose background color.  
2.13.1  
5.2.1  
SIG LEVEL  
CLUTTER  
Erase weak echoes from the screen.  
Suppress low intensity echoes.  
2.11.4  
2.13.1, 3.11.5,  
4.11.1  
RES. COLOR Set transfer characteristics of input signal level  
versus display echo level.  
2.13.1, 3.11.4,  
4.11.1  
WHITE  
Displays selected echo color in white.  
5.2.1  
MARKER  
6. Press the [MENU] key to finish.  
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5. MENU OPERATION  
Activating a short-cut key  
1. Press a CUSTOM MODE key, and the dialog box programmed for the custom key  
pressed appears. (No dialog box appears for VER. SEARCH.) The dialog box below  
is for “CLUTTER”.  
CLUTTER (HORZ):  
0 1 2 3  
Note: Vertical search can only be activated when the horizontal mode or a  
combination mode is active.  
2. Press ◄ or ► to choose option desired.  
3. Press the [MENU] key to close the dialog box.  
VERTICAL SEARCH FUNCTION  
When you find a target of interest on the horizontal display, simply press the  
function key programmed for VER. SEARCH to get a cross-sectional view of  
the vertical plane. This mode is useful for evaluating fish school concentration  
and location of the targeted fish school or for navigation purposes.  
Fish  
School  
The vertical search picture is drawn using the following specifications:  
- Horizontal range:  
- Vertical range:  
- Train marker:  
Same as set on horizontal mode  
Same as set on horizontal mode  
Train angle at the moment function key is turned on  
- Vertical scan display range: 0-90 degrees (own ship position shifted leftward)  
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5. MENU OPERATION  
5.4 SYSTEM Menu  
This menu provides items which may be set according to operator’s preference.  
5.4.1 Displaying the SYSTEM menu  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU, and then press ► to choose SYS.  
3. Press ▼ to choose GO TO SYS MENU.  
4. Press ◄ to choose YES.  
** SYSTEM MENU **  
SYSTEM SETTING:  
RANGE-SONAR MODE  
RANGE-VERTICAL MODE  
RANGE-E/S MODE  
RANGE-TRACK MODE  
COLOR PALETTE  
LANGUAGE  
SYSTEM BACKUP  
LOAD BACKUP DATA  
HEADING OFFSET, DRAFT OFFSET  
Adjusted at installation.  
ADJ MOTION SENSOR  
See installation manual.  
TX FREQ ADJUST  
TEST  
See Chapter 6.  
TEST PATTERN  
DEMO MODE  
DEFAULT  
: SELECT  
: MENU DISPLAY MENU: END  
System menu  
5-8  
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5. MENU OPERATION  
5.4.2 SYSTEM SETTING 1 menu description  
1. Display the SYSTEM menu and then press ▲ or ▼ to choose SYSTEM SETTING.  
2. Press ► to open the SYSTEM SETTING menu.  
3. Press ▲ to MENU.  
4. Press ◄ to choose “1.”  
** SYSTEM SETTING 1 **  
MENU  
1
2
POSITION  
: SHIP'S L/L SHIP'S LOP CURSOR L/L  
TRACK  
: OFF  
ON  
OFF  
TRUE  
OFF  
NAV  
GPS  
OFF  
FLOW FROM  
FLOW TO  
CURRENT DATA  
:
AZ  
HEADING INDICATION :  
ON  
NORTH MARK  
CSE DATA  
:
:
:
:
:
GYRO  
LoranC LoranA DR DECCA OTHERS  
NAV DATA  
1/2  
1/1  
fa  
TVG CORRECTION  
m
ft  
HIRO P/B  
UNIT  
:
C
F
TEMP  
OFF  
ON  
TARGET L/L  
CUSTOM KEY  
EMPHASIS MODE  
:
:
:
PRESET KEY SHORT-CUT KEY  
OFF  
OFF  
NORMAL RED  
10sec 30sec 1min 3min  
6min  
ETA MARK  
:
: CHANGE  
MENU: END  
: SELECT  
System setting 1 menu  
SYSTEM SETTING 1 menu description  
POSITION: Chooses how to display position data. The choices are latitude and longitude,  
LOP (Decca or Loran, whichever navigator is connected) or cursor latitude and longitude.  
(The connected navigator must be capable of displaying L/L or LOP.) Position data  
required.  
TRACK: Turns the track display on or off on the horizontal display. The track is always  
shown on the video plotter display regardless of this setting.  
CURRENT DATA: Turns current data (tide) on or off. FLOW FROM shows from what  
direction the current is flowing; FLOW TO shows the direction the current is heading.  
Requires connection a current indicator.  
Current Vector  
FLOW FROM  
FLOW TO  
Current vector  
5-9  
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5. MENU OPERATION  
HEADING INDICATION: Chooses heading indication format, true (figures) or azimuth  
(compass points, for example, N, S, etc.), for the echo sounder and vertical scan modes.  
Requires heading data.  
NORTH MARK: Turns the north marker on or off. Requires heading data.  
CSE DATA: Chooses heading data source, navigator or gyrocompass, with which to  
draw ship’s track. For heading sensor or gyrocompass, choose “GYRO”.  
NAV DATA: Chooses source of position data, GPS, Loran C, Loran A, DR (Dead  
Reckoning), Decca or Others (for equipment not shown, receives talker only).  
TVG CORRECTION: Changes TVG curve to compensate for attenuation absorption of  
ultrasonic wave in water. OFF, standard TVG curve; 1/2, 1/2 of the theoretical absorption  
value added to TVG curve, and 1/1, full theoretical absorption value added to TVG curve.  
UNIT: Chooses unit of depth measurement: meters, feet, fathoms, passi/braza or Hiro.  
TEMP: Chooses unit of water temperature measurement: °C or °F.  
TARGET L/L: Turn on to output event marker position to a video plotter. Requires  
heading and latitude and longitude data from external equipment.  
CUSTOM KEY: Chooses function of custom mode keys: preset or short-cut. For further  
details, see paragraph 5.3.  
EMPHASIS MODE: Chooses method of picture interpolation processing.  
OFF:  
Interpolation close to raw signal.  
NORMAL: Clarifies picture.  
RED:  
Emphasizes strong signals.  
ETA MARK: A vector line extends from the own ship marker on the horizontal mode  
display, in the direction of ship’s bow. The tip of the line shows the estimated time of  
arrival after the chosen ETA time elapses, using the current ship’s speed. ETA is  
calculated every second considering tilt and detection range. This function requires  
speed input.  
ETA marker  
ETA marker  
5-10  
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5. MENU OPERATION  
5.4.3 SYSTEM SETTING 2 menu description  
** SYSTEM SETTING 2 **  
1
2
MENU  
OFF  
ON  
STABILIZER  
:
AUTO RETRACTION : OFF  
SPEED ALARM/MESSAGE : OFF  
(OFF, 5-15kt)  
15 kt  
20kt  
SWEEP INDICATOR  
DEFAULT SETTING  
: DOT  
: NO  
LINE  
YES  
MAXIMUM ALLOWABLE SPEED IS 15 KNOTS WHILE SOUNDDOME IS BEING  
RETRACTED. IF VESSEL HAS RAPID ACCELERATION CAPABILITIES,  
AUTO RETRACTION SETTINGS OF 10-12 KNOTS ARE MANDATORY TO  
AVOID CATASTROPHIC DAMAGE TO SOUNDOME ASSY. ANY PHYSICAL  
DAMAGE TO THE SOUNDOME ASSY. IS CONSIDERED ABUSE AND IS  
NOT A WARRANTY ISSUE.  
: CHANGE  
MENU: END  
: SELECT  
System setting 2 menu  
SYSTEM SETTING 2 menu description  
STABILIZER: Choose ON to compensate for effects of ship’s pitching and rolling.  
Requires Motion Sensor MS-100 or Clinometer BS-704.  
AUTO RETRACTION: Set the speed at which automatic retraction of the transducer is to  
occur. Requires speed input.  
Note: The transducer may be retracted at a speed other than the intended one when  
ship’s speed data is erroneous. Therefore, set the speed considering the  
accuracy of speed data.  
5-11  
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5. MENU OPERATION  
SPEED ALARM MESSAGE: Choose the speed at which the speed alarm message is  
displayed and the aural alarm released when the speed goes higher than that set here.  
The audio alarm can be silenced with the [R/B] key.  
[
ª] pressed to lower transducer  
Message 1 appears. Reduce speed below 15 kts to  
restore normal operation.  
Speed above 15 kts  
Transducer being lowered  
Speed over 15 kts  
Message 1 appears and lowering continues.  
Transducer lowered  
Message 2 appears, accompanied by the audio alarm.  
Reduce the speed below 20 kts (or 15 kts) to restore  
normal operation.  
Speed above 20 kts or 15 knots  
depending on this menu setting  
[
©] pressed to raise transducer  
Message 1 appears, accompanied by the audio alarm. The  
transducer is not raised. Reduce the speed below 15 kts to  
erase the message and restore normal operation. Then,  
Speed above 15 kts  
press [©] again to raise the transducer.  
Transducer being raised  
Message 1 appears and raising continues. Reduce the  
speed below 15 kts to erase the message.  
Speed above 15 kts  
SHIPS SPEED  
EXCEEDS 15 kt.  
(SLOW DOWN UNDER 15 kt WHEN  
MOVING TRANSDUCER UNIT.)  
TRANSDUCER REMAINS  
LOWERED.  
(REDUCE SHIP'S SPEED AND PRESS  
KEY TO RETRACT IT.)  
↑
PRESS R/B KEY TO SILENCE ALARM.  
PRESS R/B KEY TO SILENCE ALARM.  
Message 1  
Message 2  
SWEEP INDICATOR: Shows train position in the horizontal mode and tilt angle in the  
vertical scan mode, with a line or a dot. (See the illustration on page 2-2 and 3-2.)  
DEFAULT SETTING: Choose YES and then press the [MENU] key to restore all default  
system menu settings. Several beeps sound while default settings are being restored  
and then normal operation is restored.  
** FACTORY SETTING **  
ARE YOU SURE?  
:
NO  
YES  
NOTE! ALL THE SYSTEM SETTING WILL BE CHANGED  
TO FACTORY SETTING.  
: CHANGE  
MENU: END  
FACTORY SETTING display  
5-12  
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5. MENU OPERATION  
5.4.4 Sonar (horizontal) mode range settings  
The user may preset horizontal mode ranges as desired.  
1. Choose RANGE-SONAR MODE at the SYS menu and then press ►.  
** RANGE-SONAR MODE **  
1
2
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
10 (10-1600m)  
20  
40  
60  
80  
3
4
5
6
100  
7
120  
160  
200  
250  
300  
400  
500  
600  
800  
8
9
10  
11  
12  
13  
14  
15  
DEFAULT SETTING :  
: SELECT  
NO YES  
: CHANGE  
MENU: END  
Range-sonar mode menu  
2. Press ▲ or ▼ to choose range number desired.  
3. Press ◄ or ► to set range.  
4. Press the [MENU] key to register settings and close the menu.  
To restore default horizontal mode range settings, choose DEFAULT SETTING, press  
► to choose YES and then press the [MENU] key.  
5-13  
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5. MENU OPERATION  
5.4.5 Vertical scan mode range settings  
As with the horizontal mode, the user may preset the vertical scan mode’s ranges.  
1. Choose RANGE-VER MODE at the SYS menu and then press ►.  
** RANGE-VER MODE **  
1
2
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
10 (10-600m)  
20  
30  
40  
60  
80  
3
4
5
6
7
100  
8
120  
160  
200  
250  
300  
400  
500  
600  
9
10  
11  
12  
13  
14  
15  
DEFAULT SETTING :  
: SELECT  
NO YES  
: CHANGE  
MENU: END  
Range-ver mode menu  
2. Press ▲ or ▼ to choose range number desired.  
3. Press ◄ or ► to set range.  
4. Press the [MENU] key to register settings and close the menu.  
To restore default vertical scan mode range settings, choose DEFAULT SETTING,  
press ► to choose YES and then press the [MENU] key.  
5-14  
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5. MENU OPERATION  
5.4.6 Echo sounder mode range settings  
As with the horizontal and vertical scan modes, the user may preset the echo sounder  
mode’s ranges.  
1. Choose RANGE-E/S MODE at the SYS menu and then press ►.  
** RANGE-E/S MODE **  
1
2
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
10 (10-600m)  
20  
30  
40  
60  
80  
3
4
5
6
7
100  
8
120  
160  
200  
250  
300  
400  
500  
600  
9
10  
11  
12  
13  
14  
15  
DEFAULT SETTING :  
: SELECT  
NO YES  
: CHANGE  
MENU: END  
Range-E/S mode menu  
2. Press ▲ or ▼ to choose range number desired.  
3. Press ◄ or ► to set range.  
4. Press the [MENU] key to register settings and close the menu.  
To restore default echo sounder mode range settings, choose DEFAULT SETTING,  
press ► to choose YES and then press the [MENU] key.  
5-15  
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5. MENU OPERATION  
5.4.7 Track range settings  
You may choose the video plotter display scale range as follows.  
1. Choose RANGE-TRACK at the SYS menu and then press ►.  
** RANGE-TRACK MODE **  
1
2
3
4
5
:
:
:
:
:
500 (100-10000m)  
1000  
2000  
4000  
8000  
DEFAULT SETTING :  
: SELECT  
NO YES  
: CHANGE  
MENU: END  
Range-track mode menu  
2. Press ▲ or ▼ to choose range number desired.  
3. Press ◄ or ► to set.  
4. Press the [MENU] key to register settings and close the menu.  
To restore default track range settings, choose DEFAULT SETTING, press ► to  
choose YES and then press the [MENU] key.  
5-16  
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5. MENU OPERATION  
5.4.8 Color palette  
The color palette lets the user change the color of echoes, background, text and menu  
as desired.  
Cursor  
** COLOR PALETTE **  
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15  
ECHO  
Arrow  
BKGD TEXT MENU  
BKGD TEXT MENU  
BKGD TEXT MENU  
BKGD1  
BKGD2  
BKGD3  
COLOR : ECHO 1  
R
G
B
:
:
:
0
2
9
DEFAULT SET : NO YES (ECHO & BKGD COLORS WILL BE CHANGED)  
: SELECT : CHANGE  
MENU: END  
Color palette  
1. Press ◄ or ► to place the cursor and arrow on the item to change. Pressing ► shifts  
the arrow and cursor from left to right.  
2. Press ▲ or ▼ to choose R(red), G(green) or B(blue) as appropriate.  
3. Press ◄ or ► to adjust color.  
4. Press the [MENU] key to register your settings and close the menu.  
To restore default color settings, choose DEFAULT SET, press ► to choose YES, and  
then press the [MENU] key. A few beeps sound while the default colors are being  
restored and then normal operation is restored.  
5-17  
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5. MENU OPERATION  
5.4.9 Language  
Menu language can be chosen from among the languages shown in the Language  
menu.  
** LANGUAGE **  
LANGUAGE:  
: CHANGE  
JAPANESE  
ITALIANO  
SVENSK  
ENGLISH  
PORTUGUES DANSK  
THAI CHINESE  
FRANCAIS ESPANOL  
NORSK  
VIETNAM  
MENU: END  
Language menu  
5.4.10 System backup  
System settings can be saved to the internal memory with the menu item SYSTEM  
BACKUP.  
** SYSTEM BACKUP **  
ARE YOU SURE?  
:
NO  
YES  
NOTE: OVERWRITES PREVIOUS BACKUP DATA.  
: CHANGE  
MENU: END  
System backup menu  
5.4.11 Loading backup data  
System data may be loaded from the LOAD BACKUP DATA menu.  
** LOAD BACKUP DATA **  
ARE YOU SURE?  
:
NO  
YES  
NOTE: OVERWRITES CURRENT SETTINGS.  
: CHANGE  
MENU: END  
Load backup data menu  
5-18  
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5. MENU OPERATION  
5.4.12 Transducer frequency adjustment  
If the CH-270 is receiving interference from a video sounder or other sonar on board your  
ship, adjust the frequency of the CH-270’s transducer to reduce the interference.  
** TX FREQ ADJUST **  
FREQ SHIFT  
:
180.0 kHz (171-189 kHz)  
: CHANGE  
MENU: END  
TX frequency adjustment menu  
5.4.13 Demonstration mode  
The demonstration mode provides a simulated sonar picture to help you become  
acquainted with how your sonar works. Connection of the transducer is not required. All  
controls are operational.  
1. Display the SYS menu.  
2. Choose DEMO MODE.  
3. Press ► to open the menu.  
** DEMO MODE **  
DEMO MODE  
:
OFF  
ON  
: CHANGE  
MENU: END  
Demo mode menu  
4. Choose OFF or ON as appropriate and then press the [MENU] key. (DEMO) appears  
at the top of the screen when the demonstration mode is active.  
5-19  
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5. MENU OPERATION  
5.4.14 Restoring all default settings  
All default menu settings may be restored. Choose YES and then press the [MENU] key  
to restore all default settings. Note that the settings stored in SYSTEM BACKUP are not  
disturbed.  
** DEFAULT **  
ARE YOU SURE?  
:
NO  
YES  
NOTE: RESET ALL THE SETTINGS INCLUDED IN SYSTEM MENU  
TO DEFAULT.  
: CHANGE  
MENU: END  
Note: All default settings will be restored. If necessary jot down  
settings which must be restored.  
Default menu  
5-20  
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6. MAINTENANCE,  
TROUBLESHOOTING  
This chapter provides the information necessary for keeping the equipment in good  
working order.  
WARNING  
Do not open the equipment.  
Hazardous voltage which can  
cause electrical shock exists  
inside the equipment. Only  
qualified personnel should  
work inside the equipment.  
6.1 Preventive Maintenance  
Check the following points monthly.  
• Check all cables. If damaged, replace.  
• Check connectors at rear of each unit. Clean if necessary.  
• Check earth of each unit. Clean if necessary.  
• Check voltage of ship’s mains to be sure it is within the equipment’s power rating.  
6.2 Cleaning the Equipment  
Dust or dirt can be removed from the exterior of equipment with a soft, dry cloth. Do not  
use chemical-based cleaners to clean the equipment – they can remove paint and  
markings.  
Cleaning the LCD  
Wipe the LCD carefully to prevent scratching, using tissue paper and an LCD cleaner. To  
remove stubborn dirt, use an LCD cleaner, wiping slowly with tissue paper so as to  
dissolve the dirt. Change paper frequently so the dirt will not scratch the LCD.  
6-1  
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6. MAINTENANCE, TROUBLESHOOTING  
6.3 Hull Unit Maintenance  
6.3.1 Lubrication  
Coat the raise/lower screw shaft once a year with Molytone grease. Also, grease the  
raise/lower main shaft (upper part of the grease cotton retainer) twice a year.  
6.3.2 Manually raising, lowering transducer  
WARNING  
Turn off the power at the ship's mains  
switchboard before conducting the  
procedure below.  
Moving parts can cause bodily injury.  
Hull unit CH-181  
1. Turn off the breaker on the hull unit and unplug the connector on the motor lead wires  
in the hull unit. (This will make raising and lowering of the soundome easier, because  
the motor which works as a generator will be isolated from the load.)  
2. Remove the top cover of the raise/lower drive assy. and attach the hand crank as  
shown below.  
Hand Crank  
Unplug connector  
on lead wires  
Hull unit, top cover of raise/lower assy. opened  
3. Turn the hand crank to check that the transducer rises and lowers smoothly, from the  
upper to the lower limit positions. If the transducer cannot be raised smoothly, do not  
use force; the shaft may bend.  
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6. MAINTENANCE, TROUBLESHOOTING  
Hull unit CH-184  
1. Turn off the breaker switch on the hull unit.  
2. Slightly loosen the bolts fastening the shaft retainer.  
3. Raise and lower the shaft by hand to confirm that it raises and lowers smoothly. If it  
does not rise or lower smoothly, do not use force; the shaft may bend.  
4. Tighten bolts on shaft retainer. (Torque: 20-25 Nm)  
5. Turn on the breaker switch.  
6.4 Transducer Maintenance  
When the ship is dry-docked, remove marine growth from the transducer with fine  
sandpaper or a piece of wood.  
CAUTION  
Do not paint the transducer face.  
Loss of sensitivity will result.  
Do not use chemical-based cleaners to  
clean the transducer.  
They can damage the transducer.  
6.5 Fuse Replacement  
The fuses in the hull and transceiver units protect them from overcurrent, equipment fault  
and reverse polarity of the ship’s mains. If the power cannot be applied the fuse in the  
transceiver unit may have blown. Have a suitably qualified technician check the fuse.  
CAUTION  
Use the proper fuse.  
Use of a wrong fuse can cause fire or  
damage the equipment.  
6-3  
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6. MAINTENANCE, TROUBLESHOOTING  
6.6 Troubleshooting  
The table below provides common symptoms of equipment troubles and the means to  
rectify them.  
Symptom  
Check, Remedy  
Cannot turn on the power. • Check ship’s mains.  
• Have a suitably qualified technician check the fuse in the  
transceiver unit.  
Bottom echo becomes  
irregular.  
• Rough seas. Distance to the bottom changes due to rolling  
and pitching.  
• Long range chosen. Transmission period is longer so ship’s  
pitching and rolling are apt to affect detection of echo.  
Weak echo  
• Output power set to minimum. Set to maximum, on the COM1  
menu.  
• Excessive TVG. Readjust TVG on the appropriate menu  
(HORZ, VERT, ES). Note that readjustment of TVG is  
necessary whenever the gain is adjusted.  
Somewhat strange picture • [BRILL] key setting too low. Increase brightness with [BRILL]  
color  
key.  
Picture contains noise.  
• Equipment not grounded properly. Check equipment ground.  
• Power cable is too close to the signal cable. Relocate power  
cable or signal cable.  
• Debris may be on sea surface. Reject unwanted noise with the  
interference rejector on the COM1 menu.  
Picture does not change  
when tilt angle is changed.  
(Bottom is not displayed in  
vertical scan picture when  
bottom is flat.)  
• Problem in tilt mechanism or control line. Contact a FURUNO  
agent or dealer for advice.  
6-4  
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6. MAINTENANCE, TROUBLESHOOTING  
6.7 Error Messages  
The table below shows the error messages which may appear on the display. All error  
messages are accompanied by the audio alarm, which you may silence with the [R/B]  
key.  
Message  
Raise/Lower Error  
Meaning, Remedy  
RAISE/LOWER FUNCTION HAS NOT BEEN  
COMPLETED.  
MAXIMUM ALLOWABLE SPEED IS 15  
KNOTS WHILE SOUNDOME IS BEING  
RETRACTED. PRESS R/B KEY TO SILENCE  
ALARM.  
Raising or lowering of transducer was not  
completed within 50 seconds. Silence the  
audio alarm with the [R/B] key and then  
reduce speed below 15 kt.  
Train Error  
TRAINING ERROR  
(CHECK HULL UNIT.)  
CPU is not receiving the heading signal.  
Check source of heading signal.  
PRESS R/B KEY TO SILENCE ALARM.  
Tilt Error  
TILT ERROR.  
CPU cannot recognize tilt position signal.  
(CHECK HULL UNIT.)  
PRESS R/B KEY TO SILENCE ALARM.  
Excessive Speed  
SHIPS SPEED EXCEEDS 15 kt.  
See SPEED ALARM MESSAGE in  
(SLOW DOWN UNDER 15 kt WHEN MOVING paragraph 5.4.3.  
TRANSDUCER UNIT.)  
PRESS R/B KEY TO SILENCE ALARM.  
TRANSDUCER REMAINS LOWERED.  
(REDUCE SHIP'S SPEED AND PRESS ↑ KEY  
TO RETRACT IT.)  
PRESS R/B KEY TO SILENCE ALARM.  
6-5  
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6. MAINTENANCE, TROUBLESHOOTING  
6.8 Diagnostics  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU, and then press ► to choose SYS.  
3. Press ▼ to choose GO TO SYS MENU.  
4. Press ◄ to choose YES.  
5. Choose TEST and then press ► to start the test. The lamps above the XDR switches  
light alternately every second while the test display is shown. In a few moments after  
pressing ► the results of the test appear.  
MAIN PROGRAM NO. 0650109-**.**  
PANEL PROGRAM NO. 0650104-0**  
ROM  
: OK  
: OK  
: OK  
: OK#  
TX FREQUENCY  
ROLL  
: 180kHz  
: 10  
RAM  
PITCH  
: 10  
VRAM  
NMEA  
TRAIN/TILT MOTOR TEST COUNT: 1  
TRAIN  
PULSES  
1080  
NG  
0
PULSES  
TILT  
NG  
*
319  
313  
454  
449  
30 > +8  
+8 > 30  
30 > 93  
93 > 30  
0
0
0
0
REMOTE CONTROL  
PANEL  
0 0 0  
0
0
0
0
127  
0
0
0
0
(LED)  
0
0
0
0
0 0 0  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
EXIT  
0
0
0
0
* = Item currently being tested.  
# = Requires special plug to test. Nothing displayed when plug is not connected.  
** = Program Version No.  
Test results  
To quit the test, press the [MENU] key three times.  
6-6  
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6. MAINTENANCE, TROUBLESHOOTING  
Interpreting the test results display  
MAIN PROGRAM NO., PANEL PROGRAM NO.: The program numbers of the MAIN  
and PANEL programs appear at the top of the display.  
ROM, RAM, VRAM, NMEA: Checked for proper operation and the results displayed as  
OK or NG (No Good). For NG contact a FURUNO agent or dealer for advice.  
TX FREQUENCY: Shows frequency of the transducer.  
ROLL and PITCH: These values change with ship’s pitching and rolling (range: -30° to  
+30°).  
TRAIN/TILT: Train/tilt test conducted maximum 1999 times, with the number of errors  
shown below “NG”.  
COUNT: Shows the number of times the test has been consecutively executed.  
At the bottom of the screen there are two major groups of zeroes (0), and they represent  
the keys and controls on the control unit and remote controller. Press a key and its  
on-screen location shows “1” while the key is pressed and “0” when it is released.  
Operate a control and its on-screen location changes as below. When the [GAIN] control  
is operated the panel dimmer increases or decreases with adjustment of the control.  
GAIN control:  
Shows 0-127.  
Other controls: Shows 0-19.  
6-7  
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6. MAINTENANCE, TROUBLESHOOTING  
6.9 Test Pattern  
A test pattern can be displayed to check for proper display of colors.  
1. Press the [MENU] key to open the menu.  
2. Press ▲ to choose MENU, and then press ► to choose SYS.  
3. Press ▼ to choose GO TO SYS MENU.  
4. Press ► to choose YES.  
5. Choose TEST PATTERN and then press ► to display the test pattern. Press ► again  
to change the test pattern. The pattern changes in the sequence shown below with  
each press of ►.  
16 tones  
of GREEN  
16 tones  
of BLUE  
16 tones  
of RED  
WHITE  
RED  
BLACK  
BLUE  
GREEN  
Test pattern  
To quit the test pattern, press the [MENU] key three times.  
6-8  
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MENU TREE  
[MENU] key  
COM1 menu  
TX POWER (MAX, MIN)  
PULSELENGTH (LONG, SHORT)  
TX RATE (EXTERNAL, 1-10; 10)  
INT REJECT (OFF, ON)  
AGC (OFF, ON)  
DEFAULT SETTINGS  
SHOWN IN BOLD ITALIC.  
AUDIO LEVEL (0-10)  
COM2 menu  
DELETING TRACK (NO, YES)  
WHITE MARKER (8-color: OFF, 1-7; 16-color: OFF, 1-15)  
SIG LEVEL (8-color: OFF, 1-6; 16-color: OFF, 1-14)  
COLOR (16, 8)  
BKGD COLOR (1, 2, 3)  
HORZ menu  
TVG LEVEL (0-10, 4.0)  
TVG DISTANCE (0-10, 4.0)  
GAIN ADJUST (-10 - +10, 0)  
RES. COLOR (LOG, LINEAR, SQUARE, CUBE)  
CLUTTER (0, 1, 2, 3)  
TARGET KEY (REVERSE, POS, ECHO)  
LOCK MODE (AUTO, MANUAL)  
AUTO TILT (OFF, 2 , 4 , 6 , 10 )  
VERT menu  
TVG LEVEL (0-10, 4.0)  
TVG DISTANCE (0-10, 4.0)  
GAIN ADJUST (-10 - +10, 0)  
RES. COLOR (LOG, LINEAR, SQUARE, CUBE)  
CLUTTER (0, 1, 2, 3)  
HORZ RANGE (x1, x2)  
ES menu  
TVG LEVEL (0-10, 4.0)  
TVG DISTANCE (0-10, 4.0)  
GAIN ADJUST (-10 - +10, 0)  
RES. COLOR (LOG, LINEAR, SQUARE, CUBE)  
CLUTTER (0, 1, 2, 3)  
A-SCOPE (OFF, ON)  
(When SHORT-CUT KEY is selected at SYSTEM SETTING 1 menu.)  
SHORT-CUT menu  
KEY1 (VER SEARCH, VOLUME, DEL TRACK, AUTO TILT, BKGD  
SIG LEVEL, CLUTTER, RES. COLOR, WHITE MARKER)  
KEY2 (Same choices as KEY1. Default setting: VOLUME)  
KEY3 (Same choices as KEY1. Default setting: DEL TRACK)  
PRESET menu  
(Default setting)  
CUSTOM1 (MODE: HORIZONTAL EXPANSION, SECTOR: 240 , TRAIN: 0 ,  
RANGE (m): 160, TILT: 30  
CUSTOM2 (MODE: HORIZONTAL, SECTOR: 360 , TRAIN: 0 ,  
RANGE (m): 160, TILT: 30 SPEED: FAST )  
CUSTOM3 (MODE: VERTICAL, SECTOR: 180 , TRAIN: 90 ,  
RANGE (m): 120, TILT: 90 SPEED: FAST )  
,
SPEED: FAST )  
,
,
(CONTINUED ON NEXT PAGE)  
M-1  
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MENU TREE  
(CONTINUED FROM PREVIOUS PAGE)  
SYSTEM menu  
SYSTEM SETTING  
SYSTEM SETTING 1  
POSITION (SHIP'S L/L, SHIP'S LOP, CURSOR L/L)  
TRACK (OFF, ON)  
CURRENT DATA (OFF, FLOW FROM, FLOW TO)  
HEADING INDICATION (TRUE, AZ)  
NORTH MARK (OFF, ON)  
CSE DATA (NAV, GYRO)  
NAV DATA (GPS, LoranC, LoranA, DR, DECCA, OTHERS)  
TVG CORRECTION (OFF, 1/2, 1/1)  
UNIT (m, ft, fa, HIRO, P/B)  
TEMP (°C, °F)  
TARGET L/L (OFF, ON)  
CUSTOM KEY (PRESET KEY, SHORT-CUT KEY)  
EMPHASIS MODE (OFF, NORMAL, RED)  
ETA MARK (OFF, 10sec, 30sec, 1min, 3min, 6min)  
SYSTEM SETTING 2  
STABILIZER (OFF, ON)  
AUTO RETRACTION (OFF, 5-15kt)  
SPEED ALARM/MESSAGE (OFF, 15kt, 20kt)  
SWEEP INDICATOR (DOT, LINE)  
DEFAULT SETTING (NO, YES)  
RANGE-SONAR MODE (all default ranges)  
(min. range: m, 10; ft, 40; fa, P/B, Hiro, 10; max. range: m, 800; ft, 2500;  
fa, 500; P/B, Hiro, 600)  
RANGE-VER MODE (all default ranges)  
m: 10, 20, 30, 40, 60, 80, 100, 120, 160, 200, 250, 300, 400, 500, 600  
ft: 30, 60, 90, 120, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1500, 2000  
fa, P/B, Hiro: 10, 20, 30, 40, 50, 60, 80, 100, 120, 140, 160, 200, 250, 300, 400  
RANGE-E/S MODE (all default ranges)  
m: 10, 20, 30, 40, 60, 80, 100, 120, 160, 200, 250, 300, 400, 500, 600  
ft: 30, 60, 90, 120, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1500, 2000  
fa, P/B, Hiro: 10, 20, 30, 40, 50, 60, 80, 100, 120, 140, 160, 200, 250, 300, 400  
RANGE-TRACK MODE (all default ranges)  
m: 500, 1000, 2000, 4000, 8000  
ft: 1000, 2000, 5000, 10,000, 20,000  
fa, P/B, Hiro: 200, 500, 1000, 2000, 4000  
COLOR PALETTE (Adjusts color of echoes, text and background.)  
LANGUAGE (JAPANESE, ENGLISH, FRANCAIS, ESPANOL, ITALIANO, PORTUGUES,  
DANSK, NORSK, SVENSK, THAI, CHINESE, VIETNAM)  
SYSTEM BACKUP (NO, YES)  
LOAD BACKUP DATA (NO, YES)  
HEADING OFFSET. DRAFT OFFSET (-180°, +180°, 0; 0 - 60 (m), 0)  
ADJ MOTION SENSOR (ROLL ANGLE: -10° - +10°, 0; PITCH ANGLE: -10° - +10°, 0)  
TX FREQ ADJUST (171 - 189 kHz, 180 kHz)  
TEST (Checks equipment for proper operation.)  
TEST PATTERN (Displays series of test patterns.)  
DEMO MODE (OFF, ON)  
DEFAULT (NO, YES)  
M-2  
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SPECIFICATIONS  
1. GENERAL  
1.1 Display System  
10.4-inch color LCD (640 x 480 dots), or locally supplied  
monitor  
1.2 Transmit Frequency  
1.3 Output Power  
180 kHz  
0.8 kW, power reduction available  
1.4 Range (factory settings)  
Range (m)  
1
2
3
4
5
6
7
8
9
10 11  
12  
13 14  
15  
Horizontal Mode  
10 20  
Vertical Scan Mode  
10 20  
40 60 80  
30 40 60  
100 120 160 200 250 300 400 500 600 800  
80 100 120 160 200 250 300 400 500 600  
1.5 Output Pulse Length  
1.6 TVG  
0.24 to 20.0 ms, according to range  
Level: 90 dB max., Distance: 0-1000 m  
2. DISPLAY UNIT/ CONTROL UNIT  
2.1 Picture Color  
Echo: 16 or 8 colors (echo)  
Background: 3 colors selected (user setting available)  
Horizontal (Normal/Expanded), Vertical Scan, Echo  
Sounder, Vertical Search  
2.2 Display Mode  
2.3 Combination Display  
2.4 External Data Indication  
Plotter, Vertical Scan, Strata, History  
L/L, Depth, Course, Ship’s speed, Water current vector,  
Track, Water temperature (External IEC 61162 data  
required)  
2.5 Audio Monitor  
2.6 Event Mark  
2 W output (4 ohms), Freq. 1.0 kHz (external speaker  
required)  
5 points  
2.7 Target Lock (three functions, selected on menu)  
Scanning Reverse  
Position Search  
Echo Search  
Scanning orientation changed by pressing key  
Auto-search for marker setting position  
Auto-search for signal level in a search zone, or manual  
search  
3. HULL UNIT  
3.1 Transducer Travel  
3.2 Raise/lower Time  
3.3 Allowable Ship’s Speed  
3.4 Stabilizer  
350 mm or 250 mm  
30 s at 350 mm travel, 4 s at 250 travel  
20 knot or less (15 knot during raise/lower operation)  
Within 30°, optional motion sensor or clinometer required  
SP-1  
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SPECIFICATIONS  
3.5 Horizontal Mode Control  
Scanning Angle:  
Scanning Center:  
6° to 360°, 24° step  
6° steps, 360° setting available  
Scanning Step Angle: Normal: 6°, High speed: 12°  
Elevation Angle: +5° to 90°, 1° step  
Time to Train Full Circle:  
Range (m)  
10  
11  
20  
11  
40  
11  
60  
11  
80  
11  
100  
11  
120  
11  
160  
14  
200  
17  
250  
21  
300  
25  
400  
33  
500  
41  
600  
49  
800  
65  
Norm  
Time  
(sec)  
Fast  
11  
11  
11  
11  
11  
11  
11  
13  
14  
16  
18  
22  
26  
30  
38  
3.6 Vertical Scan Mode Control  
Scanning Angle:  
Scanning Center:  
6° to 180°, 12° step  
0° to 180°, 6° step  
Scanning Step Angle: Normal: 3°, High speed: 6°  
Time to Train: 360°, 6° step  
Transceiver Beam Width: 8° (at 3dB/full circle).  
10° (at 6dB/full circle)  
4. I/O INTERFACE  
4.1 Data Format  
4.2 Input  
IEC 61162-1 (NMEA 0183 Ver 1.5/2.0)  
DBS, DBT, DPT, GGA, GLL, HDG, HDM, HDT, MDA,  
MTW, RMA, RMC, VDR, VHW, VTG  
TLL  
4.3 Output  
5. POWER SUPPLY  
5.1 Transceiver Unit  
5.2 Hull Unit  
12-32 VDC: 4.7-1.8 A  
12/24 VDC: 4.0/2.5 A  
Max. 10/6 A  
5.3 Rectifier  
100-115/220-230 VAC, 1 phase, 50/60 Hz  
6. ENVIRONMENTAL CONDITIONS  
6.1 Ambient Temperature  
Transceiver unit: -15°C to +55°C  
Soundome: 0°C to +35°C  
Hull unit: 0°C to 45°C  
95%  
Display/ Control unit: IPX5 (IEC 60529)  
Hull unit: IPX2  
6.2 Relative Humidity  
6.3 Waterproofing  
Transceiver unit: IPX0  
7. COATING COLOR  
7.1 Display Unit/ Control Unit Panel: N3.0, Chassis: 2.5GY5/1.5  
7.2 Transceiver Unit  
2.5GY5/1.5  
SP-2  
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INDEX  
A
inscribing in echo sounder mode............ 4-6  
inscribing in horizontal mode ................ 2-11  
inscribing in vertical scan mode............3-10  
AGC.............................................................5-1  
A-scope display.........................................4-10  
Auto retraction ...........................................5-11  
Auto tilt.......................................................2-24  
F
FACTORY SETTING display ....................5-12  
FAST SCAN key  
B
Backup data...............................................5-18  
BRILL key ....................................................1-7  
Brilliance......................................................1-7  
echo sounder mode ................................ 4-4  
horizontal mode.....................................2-10  
vertical scan mode.................................. 3-9  
FULL/HALF control  
C
Clutter  
horizontal mode....................................... 2-4  
vertical scan mode.................................. 3-7  
Fuse replacement ....................................... 6-3  
echo sounder mode...............................4-12  
horizontal mode.....................................2-24  
vertical scan mode.................................3-15  
Color palette ..............................................5-17  
Colors  
G
GAIN control................................................ 1-7  
Gain offset  
background..............................................5-2  
display......................................................5-2  
COM1 menu ................................................5-1  
COM2 menu ................................................5-2  
Control description.......................................1-1  
Current data.................................................5-9  
Custom key  
echo sounder mode .............................. 4-11  
horizontal mode.....................................2-23  
vertical scan mode................................3-14  
H
Heading data  
indication format....................................5-10  
source ...................................................5-10  
Horizontal expansion display....................2-18  
Horizontal/history display.................2-30, 2-31  
Horizontal/strata display............................2-32  
Horizontal/vertical scan display .................. 3-4  
HORZ menu..............................................2-23  
Hull unit maintenance ................................. 6-2  
choosing function.....................................5-4  
preset.......................................................5-5  
short-cut...................................................5-6  
D
Default settings..........................................5-20  
Demonstration mode.................................5-19  
Diagnostics..................................................6-6  
Display modes.............................................1-7  
I
Interference rejection ................................3-14  
E
L
Emphasis mode.........................................5-10  
Error messages...........................................6-5  
ETA marker................................................5-10  
EVENT key  
Language ..................................................5-18  
M
MAIN/SUB key.................................2-31, 2-32  
Maintenance  
echo sounder mode.................................4-5  
horizontal mode.....................................2-11  
vertical scan mode.................................3-10  
Event marker  
cleaning................................................... 6-1  
fuse replacement .................................... 6-3  
hull unit.................................................... 6-2  
preventive................................................ 6-1  
transducer ............................................... 6-3  
MENU key................................................... 1-8  
deleting from echo sounder mode...........4-6  
deleting from horizontal mode...............2-12  
deleting from vertical scan mode ..........3-11  
IN-1  
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INDEX  
Menu tree .................................................AP-1  
SYSTEM SETTING 2 menu ..................... 5-11  
N
T
North mark.................................................5-10  
Target data output..................................... 5-10  
TARGET key ...........................2-19, 2-20, 2-21  
Target lock  
P
Panel dimmer ..............................................1-7  
Picture advance speed  
choosing mode...................................... 2-19  
echo mode ............................................ 2-21  
position mode........................................ 2-20  
reverse mode........................................ 2-19  
Test pattern ................................................. 6-8  
TILT control  
(echo sounder mode)...............................4-4  
Position data  
format.......................................................5-9  
source....................................................5-10  
POWER switch............................................1-3  
Pulselength................................................2-14  
echo sounder mode ................................ 4-4  
horizontal mode ...................................... 2-6  
vertical scan mode.................................. 3-8  
Track  
R
R/B key  
echo sounder mode.................................4-7  
horizontal mode.....................................2-12  
vertical scan mode ................................3-11  
Range  
deleting.................................................... 5-2  
on/off ....................................................... 5-9  
range preset.......................................... 5-16  
TRAIN control  
echo sounder mode.................................4-3  
echo sounder mode preset....................5-15  
horizontal mode.......................................2-3  
horizontal mode preset..........................5-13  
track range preset .................................5-16  
vertical scan mode ..................................3-6  
vertical scan mode preset .....................5-14  
RANGE control  
echo sounder mode ................................ 4-4  
horizontal mode ...................................... 2-5  
vertical scan mode.................................. 3-6  
Transducer  
frequency adjustment............................ 5-19  
maintenance............................................ 6-3  
Transmitter output power.......................... 2-13  
Troubleshooting .......................................... 6-4  
TVG  
echo sounder mode.................................4-3  
horizontal mode.......................................2-3  
vertical scan mode ..................................3-6  
Remote controller ........................................1-2  
Resolution color  
curve correction .................................... 5-10  
echo sounder mode ................................ 4-8  
horizontal mode .................................... 2-14  
vertical scan mode................................ 3-12  
Tx rate......................................................... 5-1  
echo sounder mode...............................4-11  
horizontal mode.....................................2-23  
vertical scan mode ................................3-15  
U
Unit  
S
depth measurement.............................. 5-10  
temperature measurement ................... 5-10  
SECTOR control  
horizontal mode.......................................2-4  
vertical scan mode ..................................3-7  
Signal level ................................................2-17  
Speed alarm message...............................5-12  
Stabilizer....................................................5-11  
Sweep indicator.........................................5-12  
SYS menu ...................................................5-8  
System configuration.................................... vii  
SYSTEM SETTING 1 menu........................5-9  
W
White marker............................................... 5-2  
X
XDR switch (©)................................... 1-4, 1-5  
IN-2  
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