Furuno Radar Detector CI 80 User Manual

DOPPLER SONAR  
CURRENT INDICATOR  
CI-80  
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SAFETY INSTRUCTIONS  
WARNING  
ELECTRICAL SHOCK HAZARD  
Do not open the equipment.  
WARNING  
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.  
Fuse rating is shown on the equipment.  
Use of a wrong fuse can result in equip-  
ment damage.  
Continued use of the equipment can cause  
fire or electrical shock. Contact a FURUNO  
agent for service.  
Do not operate the equipment with wet  
hands.  
Electrical shock can result.  
Do not disassemble or modify the  
equipment.  
Fire, electrical shock or serious injury can  
result.  
CAUTION  
Do not place liquid-filled containers on  
the top of the equipment.  
A warning label is attached to the  
equipment. Do not remove the label.  
If the label is missing or damaged,  
contact a FURUNO agent or dealer.  
Fire or electrical shock can result if a liquid  
spills into the equipment.  
Name: Warning Label (1)  
Type: 86-003-1011-0  
WARNING  
To avoid electrical shock, do not  
Immediately turn off the power at the  
switchboard if the equipment is emitting  
smoke or fire.  
remove cover. No user-serviceable  
Code No.: 100-236-230  
parts inside.  
Continued use of the equipment can cause  
fire or electrical shock. 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.  
i
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Table of Contents  
PRINCIPLE OF MEASUREMENT................................................................................ 1  
PRINCIPLE OF MEASUREMENT, FEATURES.................................................................................. 1  
TIDE, NAV-TIDE & TIDE DIFFERENTIAL .......................................................................................... 4  
IMPORTANT NOTICE ON TIDE MEASUREMENTS.......................................................................... 8  
Features ............................................................................................................................................ 10  
SYSTEM OVERVIEW..................................................................................................11  
Control Description............................................................................................................................ 11  
How to Read the Displays................................................................................................................. 13  
MAIN MENU DESCRIPTION...................................................................................... 16  
DEP Menu ......................................................................................................................................... 16  
ECHO Menu...................................................................................................................................... 17  
TRK Menu ......................................................................................................................................... 17  
MARK Menu...................................................................................................................................... 18  
AVR Menu ......................................................................................................................................... 18  
OPERATION............................................................................................................... 19  
Basic Operating Procedure ............................................................................................................... 19  
Setting Tide Measuring Depths on the Echo Display........................................................................ 22  
Setting up the Echo Display.............................................................................................................. 23  
Setting up the Course Plot Display ................................................................................................... 24  
Marks ............................................................................................................................................... 25  
Calculating Trip Distance................................................................................................................... 26  
Calibrations (offsets) ......................................................................................................................... 26  
Water Speed Display Setting............................................................................................................. 27  
Nav Data Setting ............................................................................................................................... 28  
MAINTENANCE & TROUBLESHOOTING................................................................. 29  
Preventive Maintenance.................................................................................................................... 29  
Troubleshooting................................................................................................................................. 30  
Self Tests, Demonstration Display..................................................................................................... 31  
Self Test Results................................................................................................................................ 33  
MENU TREE............................................................................................................... 36  
SPECIFICATIONS .................................................................................................. SP-1  
ii  
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PRINCIPLE OF MEASUREMENT  
PRINCIPLE OF MEASUREMENT, FEATURES  
When a moving vessel emits an acoustical pulse into the water  
at an angle, a portion of emitted energy is reflected from the  
seabed and other microscopic objects in the sound path, such  
as plankton or air bubbles. The frequency of the received  
signal is shifted from the transmitted frequency in proportion to  
relative velocity between the vessel and underwater reflecting  
objects. This is called Doppler Effect.  
The CI-80 calculates and displays movements of ship and  
currents at specific depths by measuring Doppler shifts  
obtained from three separate directions.  
Frequency of reflected signal is  
shifted in proportion to relative speed  
between the vessel and reflecting  
objects.  
Planktonic layer  
Seabed  
Figure 1  
Ship’s Speed (Here, speed is a vector value including velocity and direction.)  
Depending on the base of measurement, ship’s speed is  
expressed in two ways:  
Ground tracking speed: Ship’s speed and course relative to  
(Absolute speed)  
seabed (fixed base)  
Water tracking speed: Ship’s speed and course relative to  
(Relative speed)  
water layer just below the vessel  
(floating base)  
Nav-aided speed:  
Ship’s speed and course obtained  
by external navigation equipment  
(GPS)  
(Absolute speed)  
1
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GPS satellites  
Nav-aided speed  
(Pseudo ground tracking speed)  
Water tracking speed  
Near-surface layer  
:Base of measurement  
Ground tracking speed  
Fixed  
Figure 2  
Tide  
Tide is movement of watermass at a particular depth.  
To know absolute tide (speed on ground), the following two  
data are required:  
1
Ship’s speed and course based on ground  
2
Ship’s speed and course based on measuring layer (A)  
Absolute tide is, then, given as a difference of these two speed  
vectors.  
2
1
Absolute Tide =  
2
Layer (A)  
1
:Base of  
measurement  
Fixed  
Figure 3  
2
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Nav Tide  
Nav-Tide is an absolute movement of watermass at a particular  
depth, taking speed information from the external navigator  
(GPS) as a pseudo ground tracking speed.  
To calculate Nav-tide, the following two data are required:  
1
Ship’s speed and course obtained by external navigation  
equipment (GPS)  
2
Ship’s speed and course based on measuring layer (A)  
Nav-tide is, then, given as a difference of these two speed  
vectors.  
2
1
Absolute Tide =  
GPS satellites  
1
Nav-aided speed  
(Pseudo ground tracking speed)  
2
Water tracking  
speed  
:Base of measurement  
Layer (A)  
Figure 4  
Tide Differential  
Tide differential is a relative movement of tides at different  
depths, layer (A) and layer (B).  
To calculate tide differential, the following two data are used:  
1
Ship’s speed and course based on layer (A)  
2
Ship’s speed and course based on layer (B)  
Tide differential between two layers is, then, given as a  
difference of these two speed vectors.  
3
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2
1
1
2
Tide Difference =  
-
-
(Movement of layer B based on  
layer A)  
or  
=
(Movement of layer A based on  
layer B)  
1
Layer (A)  
2
Layer (B)  
:Base of measurement  
Figure 5  
TIDE, NAV-TIDE & TIDE DIFFERENTIAL  
Tide (Absolute tide)  
Absolute tide can be measured in the ground tracking mode.  
10 NM (1 hour trip)  
Start of  
trip  
End of  
trip  
(Moving at 10 kt on ground)  
1
Layer A  
(Moving at 3 kt on ground)  
2
:Base of  
measurement  
Fixed  
Figure 6  
Assume that the ship and layer A are moving in the same  
direction, and ship’s speeds based on ground (Vg) and on layer  
A (Vwa) are measured as;  
Vg = 10 kt (Ship’s speed based on ground)  
Vwa = 7 kt (Ship’s speed based on layer A).  
4
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Speed of layer A based on ground (C1) can be calculated as  
follows:  
C1 = Vg – Vwa  
= 10 – 7  
= 3 (kt)  
Nav-Tide (Absolute tide)  
Absolute tide can be measured in the nav-aided mode.  
Nav-aided ship’s speed (Vn) is equivalent to ship’s ground  
tracking speed in the ideal conditions. That is, the nav-tide can  
be calculated by simply replacing Vg with Vn in the above  
equation.  
Tide Differential  
Tide differential is a relative movement of tides at different  
depths.  
It can be measured in the ground tracking, water tracking and  
nav-aided modes.  
10 NM (1 hour trip)  
Start of  
trip  
End of  
trip  
2
Layer A  
3
(Moving)  
:Base of measurement  
Layer B  
(Moving)  
2 kt  
5 kt  
Figure 7  
5
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Assuming that the ship, layer A and layer B are moving in the  
same direction, and ship’s speeds based on layer A (Vwa) and  
on layer B (Vwb) are measured as;  
Vwa = 8 kt (Ship’s speed based on layer A)  
Vwb = 5 kt (Ship’s speed based on layer B)  
Tide differential calculations in ground tracking mode  
As an absolute ship’s speed (Vg) is available in the ground  
tracking mode, tide speeds of layer A (C1) and layer B (C2)  
based on ground are calculated as follows:  
C1 = Vg - Vwa (Speed of layer A based on ground)  
C2 = Vg - Vwb (Speed of layer B based on ground)  
Thus, the tide differential (Cd) between layer A and layer B is;  
Cd = C2 - C1  
Tide differential based  
= (Vg - Vwb) - (Vg - Vwa)  
on layer A  
= Vwa - Vwb  
Speed of layer B  
= 8 - 5  
viewed from layer  
= 3 (kt)  
A
or  
Cd = C1 - C2  
= (Vg - Vwa) - (Vg - Vwb)  
Tide differential based  
on layer B  
= Vwb - Vwa  
= 5 - 8  
Speed of layer A  
viewed from layer  
B
= -3 (kt)  
In the water tracking mode, watermass just below the  
transducer (near-surface layer) is taken as the base of all  
measurements (virtual ground). Therefore, the ship and tide  
speeds in the water tracking mode are not absolute but relative  
to this near-surface layer.  
Vw = 9 kt (Ship’s speed based on near-surface layer)  
Vwa = 8 kt (Ship’s speed based on layer A)  
Vwb = 5 kt (Ship’s speed based on layer B)  
6
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10 NM (1 hour trip)  
Start of  
trip  
End of  
trip  
Near-  
surface  
layer  
1
2
3
Layer A  
Layer B  
:Base of measurement  
Assume that the ship and all measuring layers  
are moving in the same direction, but at different  
speeds.  
1 kt  
2 kt  
5 kt  
Figure 8  
7
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[READ THIS FIRST!!]  
IMPORTANT NOTICE ON TIDE MEASUREMENTS  
(In the nav-aided mode, tide accuracy depends heavily on gyro  
accuracy.)  
SETTING SHIP’S HEADING  
The CI-80 has the nav-aided mode to measure absolute tides  
even in deep waters where ground tracking is unattainable. To  
achieve reliable measurements, however, you must supply  
accurate heading (gyro) information and ship’s position (or  
speed/course) data to the CI-80.  
If you are going to use the nav-aided mode, set the reading of  
the AD converter (gyro interface) exactly with that of the master  
gyrocompass.  
Procedure  
1. Confirm that the gyrocompass has settled and all the  
necessary compensations (latitude compensation, weather  
compensation, etc.) are made correctly.  
2. Operate the AD converter to obtain the same reading as  
you read on the master gyrocompass. (Do not make  
adjustment while the ship is turning.)  
Master  
Gyrocompass  
AD Converter  
(Gyro Interface)  
Figure 9  
If the gyro reading is accurate, the CI-80 should provide  
accurate tide information. If the gyro data contains some error,  
however, you may see the following symptoms.  
Set/drift information on the nav-aided mode differs from that  
on the ground-tracking mode.  
Tide/tide differential information on the nav-aided mode  
differs from that on the ground-tracking mode.  
8
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0
0
10  
10  
10  
10  
20  
20  
20  
20  
1°  
-3°  
0.2  
0.5  
kt  
kt  
GT Mode  
NAV Mode  
GT Mode  
NAV Mode  
Figure 10  
9
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Features  
The CI-80 mainly consists of three units: a display unit, a  
transceiver unit, and a transducer, each compact enough to fit  
on small boats.  
The main features of the CI-80 are;  
Even in deep waters where ground (bottom) reference is  
not available acoustically, the CI-80 can provide absolute  
movements of measuring layers by receiving position (or  
speed) data from GPS navigator and heading data from  
gyro compass. It may be used on deep sea fishing boats or  
on ocean research vessels.  
Triple-beam system for automatic compensation against  
pitching and rolling of vessel.  
Single mold transducer for excellent mechanical beaming  
accuracy.  
DC powered for economic operation.  
Alphanumeric information display on high resolution 10 inch  
color CRT.  
Simultaneous display of tide vectors and ship’s track.  
Indispensable for maneuvering and docking.  
Echo level display constantly displays underwater  
conditions of three sounding beams.  
Target point feature predicts flow of objects (for example,  
fishing tackle) against tide.  
Easy-to-follow menu operation for control of various  
settings and measuring conditions.  
10  
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SYSTEM OVERVIEW  
Control Description  
Display unit (CI-800)  
Figure 11 Display unit  
Transceiver unit (CI-810)  
Figure 12 Transceiver unit  
11  
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Table 1 Control description  
Description  
Control  
ON