Garmin 100 User Manual

Fishfinder 100  
owners  
manual  
Thank You for choosing the GARMIN Fishfinder 100. This product is  
designed for easy operation and to provide years of reliable service.  
Introduction  
Please take the time to read this Owners Manual, and learn the  
operation of your new unit. This will help ensure that you get the most  
from the Fishfinder 100.  
Customer Service  
Product Registration  
If you encounter a problem, or just have a question, contact or Product  
Support Department at 913-397-8200, Monday — Friday 8:00 a.m. to  
5:00 p.m. Central Time.  
Have the serial  
number of your Fishfinder 100 handy and connect  
to our website (www.garmin.com). Look for the  
Product Registration link on the Home page.  
Enjoy you new Fishfinder 100 and once again thank you for choosing  
GARMIN.  
Why should you register your Fishfinder 100?  
Notification of Product Updates  
Notification of New Products  
Lost or Stolen unit tracking  
NOTE: If you have previously registered your  
GARMIN product purchase using a mail-in  
registration card, we invite you to re-register using  
our NEW on-line system. Many services provided  
by our new product registration system are now  
being automated and re-registering your purchase  
ensures you the best possible support from  
GARMIN.  
i
GARMIN Corporation warrants this product to be free from defects in  
materials and manufacture for one year from the date of purchase.  
GARMIN will, at its sole option, repair or replace any components that fail  
in normal use. Such repairs or replacement will be made at no charge to  
the customer for parts or labor. The customer is, however, responsible for  
any transportation costs. This warranty does not cover failures due to  
abuse, misuse, accident or unauthorized alteration or repairs.  
Introduction  
Limited Warranty  
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE  
EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR  
IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING UNDER  
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR  
PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU  
SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.  
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL,  
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER  
RESULTING FROM THE USE, MISUSE, OR INABILITY TO USE THIS  
PRODUCT OR FROM DEFECTS IN THE PRODUCT. SOME STATES DO  
NOT ALLOW THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL  
DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU.  
To obtain warranty service, call the GARMIN Customer Service depart-  
ment (913-397-8200) for a returned merchandise tracking number. The unit  
should be securely packaged with the tracking number clearly marked on the  
outside of the package and sent freight prepaid and insured to a GARMIN  
warranty service station. A copy of the original sales receipt is required as the  
proof of purchase for warranty repairs. GARMIN retains the exclusive right  
to repair or replace the unit or software or offer a full refund of the purchase  
price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND  
EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.  
ii  
The Fishfinder 100 Standard Package contains the following items:  
• Fishfinder 100  
Introduction  
• Surface/Flush Mount Kit  
• Wiring Adapter Cable  
Packaging and Accessories  
• Owners Manual  
• Quick Reference Guide  
*Transom Mount Transducer (w/depth/temp)  
* Optional  
Optional Transducers:  
010-10251-00 Trolling Motor Mount Adapter  
010-10252-00 Speed Sensor  
010-10107-00 Bronze Thru-Hull (w/depth/temp)  
010-10249-00 Plastic Transom Mount (w/depth/temp)  
010-10119-00 Plastic Thru-Hull (w/depth)  
010-10177-00 Bronze Thru-Hull (w/depth/temp/speed)  
010-10224-00 Plastic In-Hull (depth only)  
010-10225-00 Remote Temperature Sensor  
Accessories:  
010-10170-00 10’ Transducer Extension Cable  
010-10170-01 20’ Transducer Extension Cable  
010-10269-00 Protective Front Cover  
iii  
Introduction .......................................................................i-viii  
Customer Service................................................................................................ i  
Limited Warranty .............................................................................................. ii  
Packaging and Accessories ................................................................................ iii  
Unit Display ..................................................................................................... vi  
Installation .......................................................................... 1-9  
Selecting A Transducer ...................................................................................... 1  
Transom Mount Installation............................................................................... 2  
In-hull Installation ............................................................................................. 3  
Trolling Motor Installation ................................................................................. 4  
Wiring Harness Installation ............................................................................... 5  
Wiring to a Fuse Block ................................................................................... 5-6  
Display Installation (Surface Mount) ................................................................. 7  
Display Installation (Flush Mount) .................................................................... 8  
Testing the Installation ...................................................................................... 9  
Introduction  
Table of Contents  
Unit Operation ................................................................ 12-27  
Using the Adjustment Bar  
Range............................................................................................................... 12  
Zoom ............................................................................................................... 13  
View ................................................................................................................ 13  
Gain................................................................................................................. 14  
Setup Menu  
Chart  
Whiteline......................................................................................................... 16  
Scroll Speed ..................................................................................................... 16  
Scale ................................................................................................................ 17  
Tools  
Noise Reject ..................................................................................................... 18  
Flasher ............................................................................................................. 19  
Simulator ......................................................................................................... 19  
Numbers  
Number Size .................................................................................................... 20  
Battery Voltage ................................................................................................. 20  
Temperature .................................................................................................... 21  
Speed ............................................................................................................... 21  
iv  
Alarms  
Fish Alarm ....................................................................................................... 22  
Shallow Water ................................................................................................. 22  
Deep Water ...................................................................................................... 23  
Battery Voltage ................................................................................................. 23  
Introduction  
System  
Table of Contents  
Contrast ........................................................................................................... 24  
Beeper ............................................................................................................. 24  
NMEA Output ................................................................................................. 24  
Calibration  
Keel Offset ....................................................................................................... 25  
Water Type....................................................................................................... 25  
Units  
Depth .............................................................................................................. 26  
Temperature .................................................................................................... 26  
Speed ............................................................................................................... 26  
Memory  
Remember ....................................................................................................... 27  
Factory Setup .................................................................................................. 27  
Software Version .............................................................................................. 27  
On the Water ................................................................... 28-33  
Understanding Sonar ....................................................................................... 28  
Transducer Coverage ....................................................................................... 29  
Understanding the Chart ................................................................................. 30  
Whiteline......................................................................................................... 31  
Thermoclines ................................................................................................... 32  
Simulator Mode ............................................................................................... 33  
Appendix ......................................................................... 28-33  
Appendix A—Specfications ............................................................................. 34  
Appendix B—Alarm Messages and Icons......................................................... 35  
Appendix C—Fishfinder 100 Portable ....................................................... 36-37  
Appendix D—Index ....................................................................................... 38-  
v
The Fishfinder 100 is able to display a variety of useful information  
about the underwater environment. Below are a few things the unit will  
help you see.  
Introduction  
The unit displays water depth and can provide a warning for shallow or  
deep-water conditions.  
What can the Fishfinder 100  
Display?  
The unit can display the battery voltage that is available to the unit.  
If equipped with a capable transducer, the unit can display the water  
temperature.  
If equipped with a capable transducer or Speed Sensor, the unit can  
display the boat’s speed over water.  
The unit displays fish as arches or fish symbols and can alert you when  
a fish is detected.  
With GARMIN’s See-Thru technology the Fishfinder 100 can display  
more than just the thermocline and structure, the unit displays fish in  
and below the thermocline, trees, brush and deadfall like you have  
never seen before!  
Garmin’s unique DCG (Depth Control Gain) system provides a clear  
graphic representation of the bottom type and its shape.  
* requires optional transducer or sensor  
vi  
Transducers  
The transducer acts as the eyes and ears of your new sonar. Proper  
transducer selection and installation are critical to the operation of your  
unit.  
Installation  
The transducer transmits sound waves toward the bottom in a cone  
shape. The larger the cone angle the larger the coverage area at a given  
depth. While it is good to see as large of an area as possible, it is best to  
select a transducer that suits the water that you are on.  
Selecting a Transducer  
A wide cone angle transducer works best in shallow water. The wide  
cone angle provides a large coverage area, but at a decreased bottom  
resolution. In deeper water this can result in a large dead zone where fish  
cannot be seen.  
Wide cone angle  
A narrow cone angle transducer is better suited to deep-water  
installations. The narrow cone angle provides a smaller viewing area  
(compared to a wide cone angle transducer at the same depth) with  
improved bottom resolution and a smaller dead zone.  
Narrow cone angle  
Included in the Optional Package is a 20° cone angle, temperature  
sensing, transom mount transducer. This transducer provides good all-  
around performance. A variety of optional transducers are available from  
your local dealer or GARMIN.  
dead zone  
X
fish not seen  
X
1
Proper transducer installation is key to getting the best performance  
from your new unit. If the transducer lead is too short, extension cables are  
available from you GARMIN dealer. DO NOT cut the transducer lead, this  
will void your warranty.  
Installation  
Following are some tips and basic installation instructions for three  
popular transducers. Detailed installation instructions are provided in the  
transducer kits.  
Mounting the Transducer  
Transom Mount Installation  
010-10248-00 (depth/temp) Transom Mount Transducer.  
mount the transducer behind  
strakes, struts, fittings, water intake or  
discharge ports, or anything that creates  
air bubbles or causes the water to become  
turbulent. It is important that the  
transducer be in clean (non turbulent)  
water for optimal performance.  
Mount the transducer cable cover  
well above the waterline.  
Apply marine sealant to all  
screw threads to prevent water  
from seeping into the transom.  
Transducer should extend 1/8" below  
fiberglass hull or 3/8" below aluminum hull  
Make sure that the transducer is  
below water level when the boat  
is on plane at high speed  
OK  
Do not mount transducer directly in the  
path of the prop. The transducer can cause  
cavitation that may degrade the boat's performance  
and damage the prop.  
Mount the transducer parallel with the bottom.  
2
In-hull Installation  
The 010-10224-00 transducer is designed to be mounted inside a  
fiberglass hull. The standard plastic transom mount transducer can also be  
mounted in this fashion using this method. If using a temperature sensing  
transducer, the temperature displayed will reflect the hull temperature.  
Installation  
Mounting the Transducer  
Selecting a Location  
1. The location has to be solid fiberglass, devoid of any air bubbles,  
laminates, fillers or dead air space. The location needs to be in an area  
of clean water at all speeds. Do not place the transducer over any  
strakes or behind any obstruction on the hull that would create  
turbulence at speed.  
Weight  
transducer to  
hold it in place  
PVC Pipe  
or a Can  
Fill Pipe or Can  
with water or a  
light mineral oil  
Many modern hulls have a prelocated pocket for In-hull transducer  
installation. If you are unsure if your hull is equipped with a prelocated  
pocket, contact your hull manufacturer.  
Strip Caulk or  
RTV Sealer  
Hull Surface  
Testing the Location  
Place the transducer in the water, pointed directly at the bottom and set  
unit for optimum performance. Place the transducer in the test device as  
show on the side bar. If the sonar performance is significantly  
degraded, another location will need to be tested.  
Apply twisting  
motion to eliminate  
any trapped air  
bubbles  
Slow cure two  
part epoxy  
Weight transducer in place  
for at least 24 hours  
Installing the Transducer  
1. Lightly sand the surface of the hull and face of the transducer with 400  
grit wet or dry sandpaper.  
2. Build a dam using strip caulk about 1/4” tall. Pour about 1/8” of two  
part, slow cure epoxy in the dam. Place the transducer in the epoxy,  
turning the transducer to work out any air bubbles.  
Strip Caulk or  
RTV Sealer Dam  
3. Weight the transducer in place and allow to cure for 24 hours.  
3
Trolling Motor Installation  
Included in the 010-10251-00 transducer kit you should have:  
1. Worm Gear Clamp  
Installation  
2. Cable Ties  
3. Transducer  
Mounting the Transducer  
Mounting the Transducer:  
1. Loosen the Worm Gear Clamp until end of the band is clear of the worm  
gear.  
2. Slide the clamp band through the slots on the transducer.  
Cable Ties  
3. Place the free end of the clamp band into the worm gear and tighten  
until the band is through the worm gear.  
Worm Gear  
4. Place the clamp and transducer over the body of the trolling motor.  
Finish tightening the clamp to secure the transducer to the trolling  
motor.  
5. Secure the transducer cable to the trolling motor shaft using the  
supplied cable ties.  
Clamp Band  
If you are experiencing interference while the trolling motor is  
operating, try installing the transducer cable at right angles to the  
trolling motor power cables.  
Slide clamp band through slots on transducer  
4
Wiring Harness Installation  
The Fishfinder 100 comes with a wiring harness that connects the unit  
to power and the transducer with one easy-to-remove connection. Make  
sure the wiring harness will reach the unit before beginning installation.  
Installation  
If it is necessary to extend the power/data wires, use a wire of compa-  
rable size and keep your extension as short as possible.  
Installing the Wiring Harness  
10-18 Volt Boat Supply  
If the transducer lead is too short, DO NOT cut the transducer lead to  
lengthen the cable. This will void the warranty. Transducer extension  
cables are available in 10’ or 20’ lengths from your GARMIN dealer.  
Wiring to a Fuse Block  
+
If your boat has an electrical system, it may be possible to wire the unit  
directly to an unused holder on your current fuse block. If you are using  
the boats fuse block, remove the in-line fuse holder supplied with the unit.  
Install 2-Amp Fuse  
Installing the Wiring Harness:  
1. Determine the polarity of the fuse holder using a Test Light or Volt Meter.  
2. Install the Red (+) wire on the Positive Fuse Holder Terminal.  
3. Install the Black (-) wire on the Negative Fuse Holder Terminal.  
4. Install a 2 amp fuse in the Fuse Holder.  
-
Boat Ground  
During a typical installation, only the Red and Black wires are used. The  
Blue wire supplies NMEA data, and doesn’t have to be connected for  
normal operation of the unit.  
Continued on page 6  
5
Wiring Harness Installation (continued)  
If your boat does not have a fuse block, the unit can be wired directly  
to the battery. Make sure the 2-Amp in-line fuse supplied with the unit is  
installed.  
Installation  
The Fishfinder 100 can be connected to another piece of NMEA  
compatible electronic equipment. If equipped with a capable transducer,  
the Fishfinder 100 sends depth, temperature and speed information that  
could be displayed on another device.  
Installing the Wiring Harness  
Power/Data  
Connection  
Speed  
Temp Transducer  
Connecting a Transducer to Multiple Sensors  
6
Display Installation (Surface Mount)  
The Fishfinder 100 can be mounted to a flat surface using the supplied  
Surface Mounting Bracket.  
Installation  
Surface Mounting the Display:  
Installing the Display  
1. Position the Surface Mount in the desired location. Leave approximately  
2'’ behind the unit for cable clearance.  
2. Mark the location of the four mounting holes with a pencil.  
3. Drill pilot holes for the mounting fasteners (not included in kit).  
4. Secure the Surface Mount, using the mounting fasteners.  
5. Slip the unit into the surface mount bracket.  
6. Tighten the knobs to secure the unit to the bracket.  
The Surface Mount Bracket is designed to be secured using a flat head  
screw. If you use a screw with a countersunk head you risk damaging  
the Surface Mount Bracket.  
OK  
Surface Mount Bracket  
7
Display Installation (Flush Mount)  
The Fishfinder 100 can be mounted flush against the dash or electron-  
ics rack that is no more than 1/4” thick.  
Installation  
Flush Mounting the Display:  
Installing the Display  
1. Remove the Surface Mount Bracket and Knobs.  
2 Cut a 4.3”W x 4.35”H relief hole where the unit will be mounted.  
3. Place the display in the relief hole and tape in place.  
4. Reinstall the knobs in the unit. Install the surface mount with the cam  
lobes pointed toward the unit.  
5. Rotate the surface mounting bracket forcing the cam lobes to pull the  
unit tight against the surface. Tighten the knobs.  
Pull bracket down until cam lobe contacts surface  
8
Testing the Installation  
While it is possible to perform some checks with the boat trailered, to  
properly test the installation the boat should be in the water.  
Installation  
Press the Power button and the Fishfinder 100 should power on. If  
the unit fails to power on, verify that the wiring adapter is seated properly  
in the back of the unit, the Red and Black wires are connected to the correct  
polarity, and that the 2-Amp fuse is installed and not blown. If the unit is  
connected to a power supply that exceeds 18 VDC, a ‘Battery Voltage High’  
warning will be displayed and the unit will turn off.  
Testing the Installation  
As the unit powers on, it should immediately start showing the bottom.  
Verify that the unit is not in the simulator mode. If the unit is in the  
simulator mode, make sure that the transducer is connected to the wiring  
harness.  
To test the transducer installation, gradually increase the boat speed  
while checking the unit operation. If the unit displays intermittently or  
fails to display, verify that the transducer is aligned parallel with the bottom  
and if necessary, adjust the transducer height until the unit operates  
correctly. It may be necessary to make several adjustments to ensure proper  
operation throughout the speed range.  
When adjusting the depth of the transducer, make the adjustments in  
small increments. Placing the transducer too deep can adversely affect  
the boat’s performance and place the transducer at greater risk of  
striking underwater objects.  
9
Unit Operation  
Keypad Function  
The Arrows Keys are used to select items on the Adjustment Bar and  
Setup menu and to change field data.  
The Enter key is used to activate/deactivate Adjustment Bar and Setup  
Menu data fields for review or change  
The Setup key is used to activate/deactivate Setup Menu.  
The Power Key is used to turn the unit on/off and to activate the  
display backlight.  
10  
At the top left of the display you will find the Adjustment Bar and a  
variety of user-selectable information including Depth, Battery Voltage, Water  
Temperature, and Speed Over Water. To provide data on Water Temperature  
and Speed Over Water, the Fishfinder 100 requires a transducer capable of  
producing the particular data.  
Unit Operation  
Describing The Display  
The Depth Scale and the Flasher Function are displayed from top to  
bottom along the right side of the display. Messages and Alarm Icons are  
displayed along the bottom.  
Adjustment Bar  
The Fishfinder 100 has three levels of display backlighting, Off, Low  
and High. The backlight is activated by momentarily pressing the Power  
key. To change the backlight level, press the Power key repeatedly.  
Depth  
Battery Voltage  
Water Temperature  
If the unit is unable to track the bottom for any reason, the digits in the  
depth window will flash on and off to alert the user that the unit is not  
tracking the bottom.  
Speed Over Water  
Depth Scale  
Flasher  
Alarm/Message Icons  
11  
Using the Adjustment Bar  
The Adjustment Bar allows direct access to the settings most commonly  
changed while using the unit. These include the depth Range, Zoom setting,  
and the Gain (sensitivity) of the unit.  
Unit Operation  
The Adjustment Bar  
Place the highlight (white bar) over the desired selection using the  
RIGHT or LEFT Arrow key and the current setting will be displayed in the  
highlight. To immediately change the setting, press the UP or DOWN  
Arrow key. If you wish to review the available settings before making a  
change, press the ENTER key to activate the adjustment list.  
Current Setting  
Range  
The Range Adjustment is used to set the display depth range. The unit  
can be set to automatically track the bottom or set to a user-specified range.  
Adjustment List  
To select a Range:  
1. Highlight ‘Range’ on the Adjustment Bar.  
2. Using the UP or DOWN Arrow, place the pointer at the desired range.  
Setting the unit to automatically track the bottom:  
1. Highlight ‘Range’ on the Adjustment Bar.  
2. Using the UP or DOWN Arrow, select Auto’ at the top of the adjust-  
ment list  
12  
Zoom  
The Zoom Adjustment is used to quickly select a display zoom scale.  
Unit Operation  
To change the zoom scale:  
1. Highlight ‘Zoom’ on the Adjustment Bar.  
2. Using the UP or DOWN Arrow, select the desired display zoom level.  
The Adjustment Bar  
When a scale other than ‘No Zoom’ is selected, the Adjustment Bar will  
display a new selection labeled View.  
View  
The View Adjustment is available only when a Zoom Scale other than  
‘No Zoom’ is selected. This setting allows you to select a specific area to  
view on the display or allow the unit to automatically select a viewing area  
based on the bottom.  
To change the view:  
1. Highlight ‘View ‘on the Adjustment Bar.  
2. Press the UP or DOWN arrows to change the setting.  
Zoom Adjustment  
To have the unit automatically set a view:  
1. Highlight ‘View’ on the Adjustment Bar  
2. Using the UP or DOWN Arrow, move the slider to the top or bottom of  
the range then release and press the Arrow again.  
View Adjustment  
13  
Gain  
The Gain Adjustment allows the user to control the sensitivity of the  
Unit Operation  
units receiver. This provides some flexibility in what is seen on the display.  
To see more detail, increase the receiver sensitivity by selecting a higher gain  
(+). If there is too much detail or if the screen is cluttered, lowering the  
sensitivity (-) may increase the clarity of the display.  
The Adjustment Bar  
To change the Gain:  
1. Highlight ‘Gain’ on the Adjustment Bar.  
2. Using the UP or DOWN Arrows, move the pointer to the desired setting.  
Mid Range Gain  
Maximum Gain  
Minimum Gain  
14  
Setup Menu  
The Setup Menu contains the unit settings that should not require  
Unit Operation  
frequent change. The Setup Menu is divided into eight tabs Chart, Tools,  
Numbers, Alarms, System, Calibrations, Units, and Memory . Each tab will be  
described in more detail in this section.  
Setup Menu/Chart  
To enter and exit the Setup Menu, press the SETUP button on the face  
of the unit. The first time that the SETUP button is pressed, the Setup  
Menu will be displayed with the ‘Chart’ tab highlighted in black. Pressing  
the UP or DOWN arrow will move the highlight between the tab selections.  
Press the RIGHT arrow to access the selection fields. Each time the Setup  
Menu is accessed, the unit will return to the last edited selection field. Press  
the LEFT arrow key to get back to the tabs.  
Chart  
The ‘Chart’ tab allows the user to determine the appearance of the  
scrolling chart display. To access the ‘Chart’ tab place the highlight over it  
using the arrow keys.  
Fish Symbols  
— All available information will be displayed.  
Fish Symbols  
‘Fish Symbols’ allows the user to determine how the chart will display  
underwater targets and background information. If ‘Fish Symbols’ are  
set to ‘OFF’, the unit will display all of the available information about  
the underwater environment. If a fish symbol is selected, the chart will  
display only the information related to that symbol.  
— Suspended targets will display as symbols. In this mode  
background information will still be displayed making  
fish identification easier.  
— Same as above with target depth displayed.  
To select a Fish Symbol:  
— Suspended targets displayed as symbols. No background  
information will be displayed in this mode.  
1. Highlight the ‘Chart’ tab on the Setup Menu.  
2. Highlight the ‘Fish Symbol’ selection field and press ENTER.  
3. Using the UP or DOWN arrow select the desired symbol and press ENTER.  
— Same as above with target depth displayed.  
15  
Whiteline  
‘Whiteline’ controls how the unit displays information about the  
Unit Operation  
bottom type (hard or soft). With the Whiteline ‘OFF’, the bottom return  
will display as black and contain no information on bottom hardness. With  
Whiteline ‘ON’, the bottom return will become gray scaled and can be used  
to determine bottom hardness. See page 31 for more detail on this feature.  
Setup Menu/Chart  
To Change the Whiteline Setting:  
1. Highlight the ‘Chart’ tab on the Setup Menu.  
2. Highlight the ‘Whiteline’ selection field and press ENTER.  
3. Choose ‘ON’ or ‘OFF’ and press ENTER to accept the selection.  
Scroll Speed  
The speed that the chart scrolls from right to left can be adjusted using  
the ‘Scroll Speed’ selection field. If you are sitting still, or the chart is  
moving too fast slowing the scroll rate can be beneficial.  
Whiteline Selections  
To Adjust the Scroll Speed:  
1. Highlight the ‘Chart’ tab on the Setup Menu.  
2. Highlight the ‘Scroll Speed’ selection field and press ENTER.  
3. Choose ‘Fast’, ‘Medium’, ‘Slow’ or ‘Pause’, press ENTER to accept the  
selection.  
If you are using the Fishfinder 100 on the portable case battery power,  
slowing the scroll rate will help to conserve your battery.  
Scroll Speed Selections  
16  
Scale  
The depth ‘Scale’ is displayed vertically along the right side of the  
chart. The depth ‘Scale’ can be configured to display four different ways:  
as an ‘Overlay’, in the ‘Corners’, with ‘Basic’ or ‘No Scale’.  
Unit Operation  
To Change the Scale Setting:  
Setup Menu/Chart  
1. Highlight the Chart’ tab on the Setup Menu.  
2. Highlight the ‘Scale’ selection field and press ENTER.  
3. Choose ‘Overlay’, ‘Corners’, ‘Basic’ or ‘No Scale’, press ENTER to  
accept the selection.  
Scale — Overlay  
Scale — Corners  
Scale — Basic  
Scale — No Scale  
17  
Tools  
The Tools tab contains the ‘Noise Reject’, ‘Flasher’, and ‘Simulator’  
Unit Operation  
tools. The ‘Noise Reject’ and ‘Flasher’ tools are used to enhance the chart  
and help in identifying and providing information about an underwater  
return. The ‘Simulator’ tool is used to enhance the simulator mode by  
allowing you customize the simulated transducer selection. To access the  
Tools tab place the highlight over it using the arrow keys.  
Setup Menu/Tools  
Noise Reject  
The ‘Noise Reject’ tool helps filter unwanted noise from the chart. The  
‘Noise Reject’ tool can be turned ‘OFF’, set to ‘AUTO’(automatically) adjust  
or to a fixed ‘LOW’, ‘MED’ium or ‘HIGH’ setting.  
Remember when setting the Noise Reject tool, the higher the noise  
rejection setting, the more likely the unit is to not show fish or structure.  
Tools Tab  
To Change the Noise Reject Setting:  
1. Highlight the ‘Tools’ tab on the Setup Menu.  
2. Highlight the ‘Noise Reject’ selection field and press ENTER.  
3. Choose ‘Off’, Auto’, ‘Low’, ‘Med’, or ‘High’, press ENTER to accept the  
selection.  
Noise Reject Selections  
18  
Flasher  
With the ‘Flasher’ tool active, a graphic Flasher representation will be  
Unit Operation  
displayed on the far right side of the chart. This graphic Flasher displays  
structure and bottom returns much the same as a true Flasher. You may  
find this feature particularly useful when using ‘Fish Symbols’.  
Setup Menu/Tools  
To Turn the Graphic Flasher On and Off:  
1. Highlight the ‘Tools’ tab on the Setup Menu  
2. Highlight the ‘Flasher’ selection field and press ENTER.  
3. Select ‘ON’ or ‘OFF’ and press ENTER to accept the selection.  
Simulator  
The ‘Simulator’ tool allows you to select a transducer type for use with  
the Fishfinder 100s built in simulator. These choices allow the simulator to  
more accurately depict actual operation of the unit. For details on using the  
simulator see page 33.  
Graphic Flasher Selections  
Simulator Transducer Selections  
Graphic Flasher Tool  
19  
Numbers  
The ‘NUM’ (Numbers) tab allows you to choose whether you would  
Unit Operation  
like to see normal or large numbers on the chart. You can also configure  
the unit to display ‘Battery Voltage’, (water) ‘Temperature’, and ‘Speed’ Over  
Water if the unit is equipped with a capable transducer. To access the  
Numbers tab place the highlight over it using the arrow keys.  
Setup Menu/Numbers  
Number Size  
This setting determines the size of the numbers displayed in the  
‘Depth’, ‘Temperature’, ‘Battery Voltage’ and ‘Speed’ fields on the chart.  
To Select Normal or Large Numbers:  
1. Highlight the ‘NUM’ tab on the Setup Menu.  
2. Highlight the ‘Number Size’ selection field and press ENTER.  
3. Choose ‘Normal’ or ‘Large’, press ENTER to accept the selection.  
Battery Voltage  
Normal Numbers  
Large Numbers  
The Fishfinder 100 can display the current battery voltage on the chart.  
To Show or Hide the Battery Voltage Display Field:  
1. Highlight the ‘NUM’ tab on the Setup Menu.  
2. Highlight the ‘Battery Voltage’ selection field and press ENTER.  
3. Choose ‘Show’ or ‘Hide’, press ENTER to accept the selection.  
Battery Voltage Selections  
20  
Temperature  
The Fishfinder 100 can display the water temperature when equipped  
Unit Operation  
with a temperature sensing transducer. The unit has the ability to  
automatically sense when a temperature capable transducer is connected  
and display the water temperature. The temperature field can be shown or  
hidden regardless of the transducer installed.  
Setup Menu/Numbers  
To Set the Temperature Display Field:  
1. Highlight the ‘NUM’ tab on the Setup Menu.  
2. Highlight the ‘Temperature’ selection field and press ENTER.  
3. Choose Auto’, ‘Show’ or ‘Hide’, press ENTER to accept the selection.  
Speed  
The Fishfinder 100 can display the boats ‘Speed’ Over Water when  
equipped with a speed capable transducer. The unit has the ability to  
automatically sense when a capable transducer is connected and display  
speed. The ‘Speed’ can be shown or hidden regardlessly of the transducer  
installed.  
Temperature Display Selections  
To Set the Speed Display Field:  
1. Highlight the ‘NUM’ tab on the Setup Menu.  
2. Highlight the ‘Speed’ selection field and press ENTER.  
3. Choose Auto’, ‘Show’ or ‘Hide’, press ENTER to accept the selection.  
Speed Display Selections  
21  
Alarms  
The ‘Alarm’ tab allows you to activate and configure the four alarms  
available in the Fishfinder 100. To access the ‘Alarm’ tab place the highlight  
over it using the arrow keys. See page 35 for alarm icons and messages.  
Unit Operation  
Fish Alarm  
Setup Menu/Alarms  
The ‘Fish Alarm’ can be configured to sound by fish size. There are  
four different alarm selections: ‘Off’, ‘Small, Medium and Large’, ‘Medium  
and Large’, or ‘Large’.  
To Select an Alarm:  
1. Highlight the Alarm’ tab on the Setup Menu.  
2. Highlight the ‘Fish Alarm’ selection field and press ENTER.  
3. Choose the desired setting, press ENTER to accept the selection.  
Shallow Water  
The ‘Shallow Water’ Alarm can be set to sound a warning at a depth  
determined by the user. Before the unit will sound a warning the alarm  
must be activated.  
Fish Alarm Selections  
Activating/Deactivating the Shallow Water Alarm:  
1. Highlight the Alarm’ tab on the Setup Menu.  
2. Highlight the ‘Shallow Water’ checkbox.  
3. Pressing ENTER will insert or remove a check mark in the checkbox.  
Setting the Shallow Water Alarm Depth:  
1. Highlight the ‘Shallow Water’ Depth Field and press ENTER.  
2. Using the arrow keys input the desired depth, press ENTER to accept  
the setting.  
Shallow Water Alarm  
22  
Deep Water  
The ‘Deep Water’ Alarm can be set to sound a warning at a depth  
determined by the user. Before the unit will sound a warning the alarm  
must be activated.  
Unit Operation  
Activating/Deactivating the Deep Water Alarm:  
1. Highlight the Alarm’ tab on the Setup Menu.  
Setup Menu/Alarms  
2. Highlight the ‘Deep Water’ checkbox.  
3. Pressing ENTER will insert or remove a check mark in the checkbox.  
Setting the Deep Water Alarm Depth:  
1. Highlight the ‘Deep Water’ Depth Field and press ENTER.  
2. Using the arrow keys input the desired depth, press ENTER to accept  
the setting.  
Battery Voltage  
The ‘Battery Voltage’ alarm can be set to warn you when the battery is  
reaching a critical state of discharge.  
Deep Water Alarm  
Activating/Deactivating the Deep Water Alarm:  
1. Highlight the Alarm’ tab on the Setup Menu.  
2. Highlight the ‘Battery Volts’ checkbox.  
3. Pressing ENTER will insert or remove a check mark in the checkbox.  
Setting the Battery Volts Alarm:  
1. Highlight the ‘Battery Volts’ field and press ENTER.  
2. Using the arrow keys input the desired voltage, press ENTER to accept  
the setting.  
Battery Voltage Alarm  
23  
System  
The ‘Sys’(System) tab contains the ‘Contrast’, ‘Beeper’, and ‘NMEA’  
Output setups. To access the ‘System’ Setup Menu, use the arrow keys to  
highlight the System tab.  
Unit Operation  
Contrast  
Setup Menu/Alarms  
The display ‘Contrast’ may need to be adjusted to compensate for light  
levels or viewing angles.  
To Adjust the Contrast:  
1. Highlight the ‘System’ tab on the Setup Menu.  
2. Highlight the ‘Contrast’ Adjustment field and press ENTER.  
3. Move the slider using the arrow keys, press ENTER to accept the setting.  
Beeper  
The ‘Beeper’ field contains three settings: ‘Off’, ‘Alarms Only’, and ‘Key  
& Alarm’.  
Contrast Adjustment  
To Change the Beeper Setting:  
1. Highlight the ‘System’ tab on the Setup Menu.  
2. Highlight the ‘Beeper’ field and press ENTER.  
3. Choose ‘Off’,Alarms’, or ‘Key & Alarms’, press ENTER to accept the setting.  
NMEA Output  
The Fishfinder 100 has the ability to output information about Depth,  
Speed, and Water Temp for display on another NMEA-compatible device.  
To Activate/Deactivate the NMEA Output:  
1. Highlight the ‘System’ tab on the Setup Menu.  
2. Highlight the ‘NMEA’ Output field and press ENTER.  
3. Choose ‘Off’, or ‘On’, press ENTER to accept the setting.  
Beeper Selections  
24  
Calibration  
The ‘Cal’ (Calibration) tab contains calibrations fields for ‘Keel Offset’,  
Unit Operation  
and ‘Water Type’ (salt or fresh). These calibrations help to ensure the  
Fishfinder 100 will provide the most accurate readings at all times. To  
access the ‘Calibration’ tab, use the arrow keys to highlight it.  
Setup Menu/Calibrations  
Keel Offset  
The ‘Keel Offset’ field allows the user to offset the surface reading for  
the depth of a keel. Enter a positive number to offset for a keel. It is also  
possible to enter a negative number to compensate for a large vessel that  
may draw several feet of water. The ‘Keel Offset’ will be reflected in the  
depth reading.  
To Set a Keel Offset:  
1. Highlight the ‘Calibration’ tab on the Setup Menu.  
2. Highlight the ‘Keel Offset’ field and press ENTER.  
3. Using the arrow keys enter a new offset, press ENTER to accept the  
new setting.  
Water Type  
Since sound waves travel through fresh and salt water at different rates  
it is necessary to select the ‘Water Type’ to ensure accurate readings on the  
unit.  
To Change the Water Type:  
1. Highlight the ‘Calibration’ tab on the Setup Menu.  
2. Highlight the ‘Water Type’ selection field and press ENTER.  
3. Choose ‘Fresh’ or ‘Salt’, press ENTER to accept the selection.  
Enter (+) positive number to  
show depth from bottom of  
keel  
T
Enter (-) negative number to show  
depth from surface  
25  
Units  
The ‘Units’ tab contains settings for ‘Depth’, ‘Temperature’ and ‘Speed’.  
To access the ‘Units’ tab, use the arrow keys to highlight it.  
Unit Operation  
Depth  
The ‘Depth’ field can be configured to display in Feet (ft), Meters (mt)  
or Fathoms (fa).  
Setup Menu/Units  
To Select a Depth Unit:  
1. Highlight the ‘Units’ tab on the Setup Menu.  
2. Highlight the ‘Depth’ field and press ENTER.  
3. Select ‘Feet’, ‘Meters’, or ‘Fathoms’, press ENTER to accept the new setting.  
Temperature  
If equipped with a temperature capable transducer, the unit can display  
water temperature in Fahrenheit (°F) or Celsius (°C).  
To Select a Temperature Unit,  
1. Highlight the ‘Units’ tab on the Setup Menu.  
Depth Selections  
Temperature Selections  
2. Highlight the ‘Temperature’ field and press ENTER.  
3. Select ‘Fahrenheit’ or ‘Celsius’ press ENTER to accept the new setting.  
Speed  
If equipped with a speed capable transducer, the unit can display the  
boats ‘Speed’ Over Water. The unit can be configured to display in ‘Nautical  
Miles-Per-Hour’ (kt), ‘Kilometers-Per-Hour’ (kh), or ‘Miles-Per-Hour’ (mh).  
To Select a Speed Unit:  
1. Highlight the ‘Units’ tab on the Setup Menu.  
2. Highlight the ‘Speed’ field and press ENTER.  
3. Select ‘Miles’, ‘Kilometers’, or ‘Knots’, press ENTER to accept the  
selection.  
Speed Selections  
26  
Memory  
The ‘Memory’ tab contains the settings for unit memory, allows you to  
reset the unit to the factory setup and allows you to review software version  
information. To access the ‘Memory’ tab, use the arrow keys to highlight it.  
Unit Operation  
Remember  
Setup Menu/Memory  
The Fishfinder 100 can be set to remember All of the unit settings  
including the Adjustment Bar or the items in Setup Only.  
To Select a Memory Setting:  
1. Highlight the ‘Memory’ tab on the Setup Menu.  
2. Highlight the ‘Remember’ field and press ENTER.  
3. Choose All’ or ‘Setup Only’, press ENTER to accept the selection.  
Factory Setup  
To Restore the Factory Settings:  
1. Highlight the ‘Memory’ tab on the Setup Menu.  
2. Highlight the ‘Factory’ Setup button and press ENTER.  
3. Choose ‘OK’ to reset the unit or ‘Cancel’ to abort.  
Remember Selections  
Reset to Factory Settings  
Software Version  
The ‘Software Version’ Button will report information about the current  
software version that is in the unit.  
To Activate the Software Version Window:  
1. Highlight the ‘Memory’ tab on the Setup Menu.  
2. Highlight the ‘Software Version’ button and press ENTER.  
3. Press ENTER to close the information window.  
Software Version Information  
27  
Understanding Sonar  
If you are familiar with sonar, and can determine what is on the chart,  
this section may not be for you. This section is intended to help the novice  
user gain some understanding of how the Fishfinder 100 operates and how  
it can help improve their fishing productivity.  
On the Water  
Unit Operation and the Chart  
To understand what the unit is displaying, it is important to have a  
general knowledge of how the unit works and how it determines what to  
display. Briefly described, the unit operates by transmitting sound waves  
toward the bottom of a lake, stream or seabed in a cone shaped pattern.  
When a transmitted soundwave strikes an underwater object such as the  
bottom, a piece of structure, or a fish, sound is reflected back to the  
transducer. The transducer collects the reflected sound waves and sends the  
data to the unit to be processed and displayed on the chart. The underwa-  
ter data is displayed on the chart in the order that it is returned: first  
returned—first on the chart. The diagram in the sidebar demonstrates this  
showing an underwater scene as it would be displayed on the chart.  
Generally speaking, if the only thing between the transducer and the  
bottom is water, the first strong return will come from the bottom directly  
below the transducer. The first strong return sets the bottom level. Weaker  
secondary returns provide the detailed data. Stronger returns will display  
in darker colors, black being the strongest return. In Example 2 (page 30)  
you can see that the branches and the fish were the strongest secondary  
returns and are indicated in black on the display.  
1
2
3
1
2
3
This fish is currently in a Dead Zone and is not detected  
by the sonar. The fish is in the coverage area of the  
transducer, but remember the first strong return sets the  
bottom level. The fish will eventually be detected when  
the first strong return sets the bottom level below the  
fish.  
That is brief description of how your Fishfinder operates. Lets take a  
look at how this data can help you to improve your fishing.  
28  
Transducer Coverage  
The area covered by the transmitted sound waves is determined by the  
cone angle of the transducer and the water depth. Using Garmins standard  
20° transducer, the coverage is approximately 1/3rd of the water depth. As  
shown in Example 1, the coverage area at a 30 foot depth is approximately  
a 10 foot diameter circle. The scale below illustrates how coverage  
increases as depth increases.  
On the Water  
Transducer Coverage  
Coverage  
Diameter  
Coverage  
Diameter  
Depth  
Depth  
1'  
2'  
3'  
4'  
5'  
6'  
7'  
8'  
9'  
10'  
3'  
4"  
3'  
10"  
15"  
20"  
25"  
30"  
35"  
40"  
6'  
6'  
9'  
9'  
12'  
15'  
18'  
21'  
24'  
27'  
30'  
12'  
15'  
18'  
21'  
24'  
27'  
30'  
45"  
45"  
8° Transducer Coverage Chart  
Example 1.  
29  
Understanding the Chart  
It is important to understand that the unit does not display a 3-D  
representation of the underwater environment. The unit can display  
multiple things at the same time, but can not determine where the return  
originated only when it was received.  
On the Water  
Understanding the Chart  
Example 2 provides a look at the underwater world from a top view,  
and relates that view to what would be displayed on the chart. On the chart  
it appears the fish and tree are side by side, but when we look at the scene  
from the top we can see that the fish is several feet from the tree. It is  
important to remember that the fishfinder can not determine where in the  
coverage area the tree or fish are, only that the returns were received in the  
same time frame.  
Branches  
Enlarged  
Transducer  
Fish  
View  
Branches  
Enlarged  
Transducer  
View  
Fish  
Remember that the Fishfinder displays a 2D  
picture of the underwater environment. The  
fish and tree could be located anywhere in the  
coverage area at that slice of time.  
Example 2.  
30  
Whiteline  
The Fishfinder 100 can help you to determine if the bottom is hard or  
soft. When the sonar soundwaves are reflected back by the bottom, a hard  
bottom will return a stronger signal than a soft bottom. The stronger  
bottom return, the wider the bottom layer is displayed. The unit uses the  
whiteline function to make this bottom layer information easier to  
distinguish.  
On the Water  
Understanding the Chart  
When viewing the display without Whiteline active, the bottom return  
is black. While you can make some determination of the bottom type, the  
black return makes this more difficult. With the whiteline active the  
bottom return appears layered in shades of gray and black and makes  
determining the bottom type easier and more reliable. Example 3 shows  
the bottom return with and without the whiteline activated.  
Whiteline can also help you to determine the  
type of bottom structure that is displayed on  
chart. By determining the hardness of the  
structure you can make a better informed  
decision on the type of structure.  
Hard  
Bottom  
Soft  
Bottom  
Structure is hard,  
probably a rock or stump  
Structure is soft,  
probably a mud pile  
Whiteline Turned Off  
Whiteline Active  
Whiteline  
Example 3.  
31  
Thermoclines  
One of the unique features offered by GARMIN is See-Thru™  
technology. See-Thru™ technology allows the Fishfinder 100 to see  
through thermoclines and helps locate fish where they live, and fish love  
the thermocline.  
On the Water  
Understanding the Chart  
A rough definition of a thermocline is a break in water where the water  
temperature changes faster than the water above it. The thermocline  
usually displays as a gray level as shown below.  
Thermocline  
32  
Simulator Mode  
The Fishfinder 100 comes with a built-in simulator mode that will  
allow the user to practice and learn the operation of the unit at home rather  
than on the water.  
On the Water  
To start the simulator mode, turn the unit on without a transducer  
installed. As the unit powers on, the unit will indicate that it is running the  
simulator mode by displaying a message across the bottom of the chart.  
The message will be replaced by the simulator mode icon in the lower left  
corner of the chart. While in the simulator mode, the unit will display a  
random bottom scene and the Fishfinder 100 can be controlled just as if it  
were on the water.  
Simulator Mode  
The unit can be configured to act as if a variety of transducers are  
installed while in the simulator mode.  
To Select a Specific Transducer:  
1. Press the Setup button on the face of the unit.  
Simulator Message and Icon  
2. Using the arrow keys, highlight the ‘Tools’ tab then the ‘Simulator’  
selection field.  
3. Press ENTER. Choose the desired transducer from the list.  
4. Press ENTER to accept the transducer selection.  
To exit the Simulator, turn the unit off.  
Simulator Transducer Selections  
33  
Physical  
Case: Fully Gasketed, high-impact plastic alloy  
Appendix A  
Display: 3.3” x 2” (8.3 x 5 cm) 160 H x 100 W pixels  
Size: 4.9” H x 5.3W x 2.7” D (12.5 x 13.5 x 6.9 cm)  
Weight: 13 oz.  
Specifications  
Temperature Range: +5° to 158°F (-15C to 70C)  
Waterproof: IEC 529, level IPX-7 (submerged to 1 meter for 30 minutes)  
Power  
Input: 10 to 18 VDC with High Voltage Protect  
Usage: 3.5 watts maximum  
Nominal: 12 VDC @ 0.28 amps  
Performance  
Sonar Power Output: 150 watts (RMS), 1200 watts (peak to peak)  
Frequency: 200 kHz  
Depth 200 foot max depth*  
NMEA  
Support: NMEA 0183 Versions 2.0 - 2.3  
Output Sentences: DBT, DPT, MTW, VHW  
* Depth capacity is dependent on water salinity, bottom type and other water conditions.  
Specifications subject to change without notice.  
34  
Alarm Messages and Icons  
The Fishfinder 100 displays a message when an alarm is tripped. To  
clear the message press the ENTER key. If the ENTER key is not pressed,  
the unit will automatically remove most messages after 10 seconds and  
display a reminder icon in the lower left corner of the chart until the alarm  
is no longer valid.  
Appendix B  
Messages and Alarms  
Battery Voltage Low  
Deep Water Alarm  
Unit Needs Repair  
Unit Needs Repair  
Memory Deleted  
Shallow Water Alarm  
Supply Voltage Low  
Supply Voltage High  
Increase Setting  
Fish Alarm  
35  
Fishfinder 100 Portable  
The Portable Case  
Appendix C  
The Portable Case is designed for rugged use and provides storage for  
the Battery Pack and the Portable Suction Cup Transducer and a mount for  
the Fishfinder 100. The case is water resistant but is not designed to float in  
the event it should go overboard.  
Fishfinder 100 Portable  
Use the two square eyelets located by the handle to secure the  
Fishfinder 100 Portable Case to the boat.  
The Suction Cup Transducer  
Using the Portable unit you will still need to find a suitable location for  
the transducer. If you are in a slow moving boat such as a canoe or flat  
bottom boat, the mounting location is not as critical. Follow these simple  
guidelines and you should be fine.  
1. Look for clean (non-turbulent) water  
Secure Fishfinder 100 to the  
boat using the provided eyelets  
2. Mount the transducer with approximately 1/2” extending beyond the  
bottom of the boat.  
3. Do not mount the transducer behind strakes on the bottom of the boat  
or in the path of a prop.  
4. If you experience poor reception, try another location.  
WARNING! Speeds in excess or 20 MPH may cause the  
transducer to fly off and strike occupants of the boat.  
36  
When storing the Suction Cup Transducer in the case, dry the  
transducer and cable to avoid corrosion. If using in Salt Water, rinse the  
transducer and cable in fresh water and dry before storing in the case.  
Appendix C  
Batteries  
The Fishfinder 100 Portable comes with a D-Cell battery pack. Eight  
D-Cell Alkaline batteries will provide approximately 20 hours of continu-  
ous operation. You have the option of purchasing a 12 Volt Rechargeable  
Gel-Cell Battery for the portable case. If using a Gel-Cell battery you can  
anticipate approximately 40 hours of continuous operation between  
charges. Cold temperatures reduce battery life.  
Fishfinder 100 Portable  
Installing the D-Cell Batteries:  
1. Disconnect the Red and Black leads.  
2. Install the batteries noting the correct polarity.  
3. Reconnect the Red and Black leads and place the battery pack (batteries  
down) in the provide location within the case.  
D-Cell and Optional Gel-Cell Battery Packs  
Installing a Gel Cell Battery:  
Verify that the Gel-Cell battery has male spade connectors installed on  
the positive and negative leads.  
Install the battery pack into  
the moulded location in the  
Portable case  
1. Disconnect the Red and Black leads and remove the D-Cell Battery Pack.  
2. Connect the Red and Black Gel-Cell leads to the Red and Black wires in  
the portable case.  
3. Place the Gel-Cell battery in the same location as the D-Cell Battery  
Pack. The Portable Case was designed to accommodate a 12 Volt Gel-  
Cell battery and hold it securely in place.  
37  
A
Accessories ...................................................................................................... ii  
Adjust the Scroll Speed .................................................................................. 16  
Adjustment Bar .............................................................................................. 12  
Alarms .................................................................................................... 22, 35  
Arrow Keys .................................................................................................... 10  
Appendix D  
Index  
B
Batteries ......................................................................................................... 37  
Battery Voltage (alarm) .................................................................................... 23  
Battery Voltage (display) ................................................................................ 20  
Beeper ............................................................................................................ 24  
C
Calibration ..................................................................................................... 25  
Chart ............................................................................................................. 15  
Contrast ......................................................................................................... 24  
D
Deep Water .................................................................................................... 23  
Depth ............................................................................................................ 26  
Display ........................................................................................................... vi  
Display Installation ..........................................................................................  
7
E
Enter Key ........................................................................................................ 10  
F
Factory Setup ................................................................................................ 27  
Fish Alarm ...................................................................................................... 22  
Fish Symbols ................................................................................................. 15  
Fishfinder 100 Portable ................................................................................. 36  
Flasher ............................................................................................................ 19  
Flush Mount ..................................................................................................... 8  
G
Gain............................................................................................................... 14  
38  
I
In-hull Installation ...........................................................................................  
3
Installing the Display ....................................................................................... 7  
Appendix D  
K
Keel Offset ...................................................................................................... 25  
Keypad .......................................................................................................... 10  
Index  
L
Limited Warranty .............................................................................................. i  
M
Memory .......................................................................................................... 27  
Messages ........................................................................................................ 35  
N
NMEA Output ............................................................................................... 24  
Noise Reject .................................................................................................... 18  
Number Size ................................................................................................... 20  
Numbers......................................................................................................... 20  
O
Operation ...................................................................................................... 28  
P
Portable Case ................................................................................................. 36  
Power Key ..................................................................................................... 10  
R
Range ............................................................................................................. 12  
Remember ...................................................................................................... 27  
S
Scale .............................................................................................................. 17  
Scroll Speed ................................................................................................... 16  
Setup Key ...................................................................................................... 10  
Setup Menu ................................................................................................... 15  
Shallow Water ................................................................................................ 22  
Simulator ....................................................................................................... 19  
39  
S
Software Version ............................................................................................ 27  
Specifications ................................................................................................. 34  
Speed 2...................................................................................................... 1, 26  
Suction Cup Transducer ................................................................................. 36  
System ............................................................................................................ 24  
Appendix D  
Index  
T
Table of Contents ............................................................................................ vi  
Temperature ........................................................................................... 21, 26  
Testing the Installation ...................................................................................... 9  
Tools ............................................................................................................... 18  
Transducers ..................................................................................................... 1  
Transom Mount Installation .............................................................................  
2
Trolling Motor Installation ............................................................................... 4  
U
Understanding Sonar ..................................................................................... 28  
Units.............................................................................................................. 26  
V
View .............................................................................................................. 13  
W
Water Type ..................................................................................................... 25  
Whiteline ....................................................................................................... 16  
Wiring Harness Installation ........................................................................ 5, 6  
Z
Zoom .............................................................................................................. 13  
40  
© 1999 GARMIN Corporation  
GARMIN International, Inc.  
1200 East 151st Street, Olathe, Kansas 66062, U.S.A.  
GARMIN (Europe) Ltd.  
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.  
GARMIN (Asia) Corporation  
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan  
www.garmin.com  
Part Number 190-00173-00 Rev. A  

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