Garmin Fish Finder 90 140 User Manual

Owner’s Manual  
Fishfinder 90/140  
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INTRODUCTION > ABOUT THIS MANUAL  
INTRODUCTION  
This manual covers the features and operation of the  
Fishfinder 90/140.  
The Operating Your Fishfinder section describes the  
features and operation of the Fishfinder 90/140.  
The Appendix contains unit specifications ,optional  
accessories, and care information. You can also find  
warranty information, the Software License Agreement and  
European Licensing Requirements in the Appendix.  
About This Manual  
To get the most out of your Fishfinder 90/140, take time to  
read this manual and learn the operating procedures for your  
unit in detail. This manual is organized into the following  
sections.  
An Index is provided at the end of the manual for reference.  
Manual Conventions  
The Introduction sections contains the Table of Contents,  
This manual uses the term Warning to indicate a potentially  
hazardous situation, which, if not avoided, could result in  
death or serious injury.  
Product Registration, and Product Support Information.  
The Getting Started sections contain information about  
sonar and the Fishfinder.  
This manual uses the term Caution to indicate a potentially  
hazardous situation, which, if not avoided, may result  
in minor injury or property damage. It may also be used  
without the symbol to alert you to avoid unsafe practices.  
The Installing Your Fishfinder section provides instruction  
on installing the Fishfinder and the Transducer. If you  
experience difficulty installing the Fishfinder, contact  
Garmin Product Support or an installation professional in  
your area.  
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INTRODUCTION > TABLE OF CONTENTS  
TABLE OF CONTENTS  
iv  
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INTRODUCTION > PRODUCT REGISTRATION  
Contact Garmin  
Product Registration  
Contact Garmin if you have any questions while using  
your Fishfinder 90/140. In the USA contact Garmin  
Product Support by phone: 800/800.1020 or 913/397.8200,  
Monday–Friday, 8 AM–5 PM Central Time; or go to www.  
garmin.com/support/, and click Product Support.  
Help us better support you by completing our online  
registration today! Connect to our Web site at www.garmin.  
Use this area to record the serial number (8-digit number  
located on the back of the Fishfinder 90/140) in case your  
Fishfinder 90/140 needs service. Keep the original sales  
receipt, or a photocopy, in a safe place.  
In Europe, contact Garmin (Europe) Ltd. at  
+44 -1794-519944 (outside the UK) or  
0870-8501242 (UK only).  
Serial Number: ___ ___ ___ ___ ___ ___ ___ __  
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INTRODUCTION > WARNING  
Warning  
Failure to avoid the following potentially hazardous situations could result in an accident or collision resulting in death or  
serious injury.  
When navigating, carefully compare information displayed on the Fishfinder 90/140 to all available navigation sources, including  
information from visual sightings, and maps. For safety, always resolve any discrepancies or questions before continuing navigation.  
WARNING: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth  
defects, or reproductive harm. This Notice is being provided in accordance with California’s Proposition 65. If you have any questions or  
would like additional information, please refer to our Web site at http://www.garmin.com/prop65.  
vi  
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GETTING STARTED > UNDERSTANDING THE FISHFINDER  
you might want to learn a bit about sonar: what it is, how it  
works, and what you might see on the Fishfinder 90 or 140  
screen. This manual does not go into technical detail about  
sonar, but it can give you a general understanding of those  
things that you need to know about sonar that can help you  
interpret the screen and find the fish.  
GETTING STARTED  
To get the most out of your new Fishfinder:  
Before you install and use your Fishfinder, read the  
information in this manual.  
Assemble and install the hardware (page 5).  
Practice using your Fishfinder in Simulator Mode  
(page 4).  
Understanding Sonar  
During installation, you connect your Fishfinder 90 or 140  
to a transducer. The transducer uses sound to determine  
information about what is in the water beneath your boat.  
Then the transducer sends the information to your Fishfinder  
to be displayed on the screen for you to view and interpret.  
Use the Fishfinder (page 13).  
Understanding the Fishfinder  
The Fishfinder 90 or 140 is a fully automatic sonar unit  
that allows you to go out on the water and find fish without  
having to configure a lot of settings; or, if from experience  
you know exactly how you want your Fishfinder screen to  
look and function, you can customize each setting to your  
specific needs.  
The transducer sends sound waves down into the water  
in a cone shape, similar to a flashlight beam (covering a  
smaller circular area at the top and angling out to a larger  
circular area at the bottom). These sound waves reflect off  
of any object that they hit, and then the waves travel back  
up to the transducer. These objects could be fish, branches,  
the bottom, or any other object that has density that is  
different from the water. The transducer receives the sound  
If you have used a Fishfinder before, and you know how  
to interpret the sonar information on the screen, you can  
skip this section. If you have not used a Fishfinder before,  
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GETTING STARTED > UNDERSTANDING DUAL BEAM TRANSDUCER COVERAGE  
wave information, and then sends the information to the  
Fishfinder. The Fishfinder displays the information on the  
screen for you to see and interpret. The type of transducer  
and settings you choose determine how the information is  
shown on the screen.  
Understanding Dual Beam Transducer  
Coverage  
Narrow  
Beam  
Wide  
Beam  
A dual beam transducer can transmit a narrow or a wide  
beam. The water area covered by the transmitted sound  
waves is determined by the beam width of the transducer  
and the water depth. The narrow beam provides crisp detail  
of what is under your boat, and is helpful if you are fishing  
in deeper water where the beam covers more area (for  
example, at a 30-foot depth, the narrow beam covers the  
area of about a 7-foot circle).  
The wide beam is more helpful in shallow water, because  
it gives you a much wider view of objects in the water,  
including areas beyond the sides of your boat. At a 30-foot  
depth, the wide beam covers the area of approximately a  
20-foot circle.  
2
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GETTING STARTED > UNDERSTANDING THE FISHFINDER SCREEN  
Depth range  
Water depth  
Understanding the Fishfinder Screen  
Experimentation and experience are the keys to successfully  
interpreting your Fishfinder screen. We recommend that you  
take your Fishfinder out on familiar water, and spend time  
learning to interpret what you see on the Fishfinder 90 or  
140 screen.  
Water  
temperature at  
the transducer  
You see  
suspended targets  
as arches or fish  
symbols.  
Think of the Fishfinder screen as if you took a picture  
from the side of an aquarium in your home. You can see  
how deep a fish is in the water (how close it is to the top  
or bottom), but you cannot tell where the fish is located  
horizontally in the water (whether it is near the front or the  
back of the aquarium). Remember this when you are trying  
to locate exactly where something is in the water.  
Structure  
Simulator  
mode  
indicator  
Bottom shape and type  
The strongest sonar returns appear on your screen as solid,  
dark areas. The weakest returns appear less intense, less  
solid. The bottom of the water body returns the strongest  
signal, so you can identify the bottom as the continuous,  
solid line running across the bottom of the screen. The  
strength of the sonar return can also help you interpret the  
hardness of the bottom. The thicker the bottom line, the  
harder the bottom.  
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GETTING STARTED > USING SIMULATOR MODE  
The Fishfinder 90 and 140 include the latest technology  
in interpreting bottom signals; they can see through fish,  
structures, and thermoclines (shown in the weakest hues).  
Even so, large schools of fish or dense structures close to  
the bottom can affect water depth return readings.  
you want to see suspended targets indicated by a fish shape  
instead of arches (Page 16).  
Using Simulator Mode  
Use Simulator Mode to practice and learn the operation of  
the Fishfinder. If the Fishfinder does not detect a transducer  
at startup, it automatically starts in Simulator Mode.  
NOTE: If the Fishfinder is unable to track the bottom  
for any reason, the digits which indicate depth flash on  
and off to alert you that the Fishfinder is not tracking  
the bottom.  
While in Simulator Mode, the Fishfinder displays a bottom  
scene, and you can control the Fishfinder (except the Gain  
and Auto Gain options) just as if it were on the water.  
If no keys are pressed for two minutes, the Fishfinder  
automatically resets to default settings while in Simulator  
Mode.  
Along the top of the screen, you might see a grouping of  
intense hues. This area is surface clutter, which can be  
caused by waves or any other sonar interference at the  
surface of the water. Too much surface clutter can obscure  
your view of fish. You can turn down the Gain setting to  
reduce this surface clutter (Page 14).  
To exit Simulator Mode, turn off the Fishfinder.  
You can see in the previous illustration how the fish are  
indicated in a few different ways. By default, fish appear  
as arches. Actual fish returns might not always appear as  
perfect arches, due to the speed, fish orientation, or other  
conditions. You can also turn on the Fish Symbols setting if  
4
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INSTALLING YOUR FISHFINDER > PACKING LIST  
E
F
INSTALLING YOUR FISHFINDER  
A
Make sure you completely read and understand all  
instructions before you install and use your Fishfinder. If  
you have problems, contact Garmin Product Support, or  
seek other professional assistance.  
B1  
D
(Fishfinder 140)  
B2  
C
You can install the Fishfinder hardware on a transom or on  
a trolling motor. Before installation, make sure the wiring  
harness can reach the Fishfinder and transducer locations.  
(Fishfinder 90)  
(Fishfinder 90)  
G
Check the packing list below. If you are missing any items,  
contact your Garmin dealer.  
S
H
Packing List (one of each, unless otherwise noted):  
(Cable not shown)  
AFishfinder sonar unit  
ITrolling motor mount gasket  
I
B1Swivel mount bracket (Fishfinder  
140; optional for Fishfinder 90); or  
B2Tilt mount bracket (Fishfinder 90)  
CSwivel base (Fishfinder 140)  
DMounting knobs  
EMounting knob spacer  
FSnap ring  
GTransducer with power cable  
HTransducer mount  
J5 mm Flat washers (2)  
K5 x 30 mm Screws (2)  
L10-32 Lock nut  
M4 x 12 mm Screws (4)  
N10-32 x 1.75 Screw  
O1/4" Cable clamps (2)  
PPlastic spacer  
Q1/4" Rubber washer  
RCable tie, 5.6" (4)  
SCable tie, 20”  
J
K
L
N
O
P
R
Q
M
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INSTALLING YOUR FISHFINDER > INSTALLING THE TRANSDUCER  
Mounting the Transducer on a  
Trolling Motor  
Installing the Transducer  
Assembling the Transducer  
1. Slide the large cable tie (S) through the slot on the  
transducer mount (H) with the ridges of the band  
facing up until equal lengths extend on both sides of  
the mount. (NOTE: For cold water, or heavy timber  
or debris areas, a metal 4-5" worm gear clamp is  
recommended.)  
1. Insert the rubber washer (Q) and plastic spacer (P)  
into the transducer (G) at the same time. DO NOT  
lubricate the rubber washer.  
2. Route the cable toward the back of the transducer.  
Slide the transducer into the transducer mount (H).  
3. Place a 5 mm flat washer (J) on the 10-32 x  
1.75" screw (N), and insert the screw through the  
transducer mount, spacer, and rubber washer.  
2. Position the mount gasket (I) on the curved top of  
the transducer mount.  
3. Place the transducer assembly  
against the motor body of the  
trolling motor, with the front  
of the transducer pointed  
away from the trolling motor  
propeller.  
4. Place the remaining 5 mm flat washer on the  
exposed end. Install the 10-32 lock nut (L) finger  
tight. You can tighten the transducer further after  
installation on the boat.  
Back of the transducer  
Cable tie  
slot  
6
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INSTALLING YOUR FISHFINDER > INSTALLING THE TRANSDUCER  
4. Wrap the two ends of the cable tie around the motor  
body. Place the pointed end of the cable tie through  
the fastener hole on the opposite end and pull it  
through until it is snug but not tight. (The cable tie  
clicks when you pull it.)  
Mounting the Transducer on a Transom  
Tool List (not included)—drill, 3/8" wrench or socket,  
5/32" and 1/8" drill bits, masking tape, #2 Phillips  
screwdriver, and marine sealant.  
When selecting a transom mount location, consider the  
following for optimal performance:  
5. Position the transducer so that it is parallel with the  
bottom when in use, and make sure the gasket is  
aligned properly. Pull the cable tie end until tight.  
Trim off the excess, if necessary. Tighten the 10-32  
locking nut until it touches the mounting bracket and  
then tighten 1/4 turn more. (Do not overtighten.)  
For your sonar to operate properly, the transducer  
must be located in calm water. DO NOT mount the  
transducer behind strakes, rivet lines, struts, fittings,  
water intake, discharge ports, eroding paint, or  
anything that creates turbulence.  
6. Route the 20’ (6 m) transducer cable using the  
supplied cable ties to secure the cable to the motor  
shaft. You can fill the forward-facing portion (except  
the cable tie pocket) of the transducer mount with  
sealant to avoid accumulating debris.  
Mount the transducer as close to the center of the boat  
as possible.  
DO NOT cut the transducer lead. (This voids your  
warranty.)  
DO NOT mount the transducer in locations where it  
might be jarred when launching, hauling, trailering,  
or storage.  
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INSTALLING YOUR FISHFINDER > INSTALLING THE TRANSDUCER  
DO NOT mount the transducer in the path of the  
prop on single-drive boats. The transducer can cause  
cavitation that can degrade the boat’s performance  
and damage the prop. On twin-drive boats, mount  
the transducer between the drives, if possible.  
Do not mount the transducer behind  
strakes, rivet lines, struts, fittings, water  
intakes or discharge ports.  
Mount the transducer  
parallel with the water line.  
Make sure the transducer is below  
water level when the boat is on plane  
at high speed.  
Apply marine sealant to all screw threads to prevent  
water from seeping into the transom.  
8
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INSTALLING YOUR FISHFINDER > INSTALLING THE TRANSDUCER  
5. Place the first cable clamp on the transducer cable  
approximately one third of the distance between  
the transducer and the top of the transom. Mark  
the location. Using a 1/8" bit, drill a pilot hole  
approximately 3/8" (10 mm) deep.  
To mount the transducer on a transom:  
1. Position the transducer mount at the selected  
transom location. Make sure the transducer is  
parallel with the water line. Mark the center locations  
of each hole on the transducer mount. (See the  
figures on the next page.)  
6. Attach the cable clamp using a 4 x 12 mm screw.  
Coat the screw with marine sealant before  
installation. Repeat steps 5 and 6 using the other  
cable clamp.  
2. Using a 5/32" bit, drill the pilot holes approximately  
1" (25 mm) deep at the marked locations. To avoid  
drilling the holes too deep, wrap a piece of tape  
around the bit at 1" from the point of the bit.  
7. Route the transducer cable, as needed, to the  
Fishfinder. DO NOT CUT THE CABLE. Avoid routing  
the cable with electrical wires or other sources of  
electrical interference.  
3. Apply marine sealant to the 5 x 30 mm screws.  
Attach the transducer assembly to the transom  
using the 5 x 30 mm screws. Adjust the transducer  
assembly to extend beyond the bottom of the  
transom approximately 1/8" (3 mm) on fiberglass  
hulls or 3/8" (10 mm) on aluminum hulls. Adjust the  
transducer assembly to be aligned parallel with the  
water.  
4. Tighten the 10-32 locking nut until it touches the  
mounting bracket, and then tighten 1/4 turn more.  
(Do not overtighten.)  
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INSTALLING YOUR FISHFINDER > INSTALLING THE FISHFINDER UNIT  
Drill pilot holes here.  
Level  
Installing the Fishfinder Unit  
Selecting a Fishfinder installation Location  
Select a Fishfinder installation location that allows you to  
view and operate it easily while operating the vessel. Select  
a mounting surface strong enough to support the weight  
of the Fishfinder and protect it from excessive vibration or  
shock. DO NOT mount the bracket in a location where the  
Fishfinder is exposed to extreme temperature conditions.  
When installing the mounting bracket, be sure to allow  
room to connect and rout the power cable.  
Align with the  
transom bottom. The  
transducer should  
extend 1/8" below  
fiberglass hulls or  
3/8" below aluminum  
hulls.  
Keep it parallel with the water line.  
Mounting the Bracket Assembly  
Tool List (not included)—drill, screwdriver (Phillips or  
OK  
standard), three #8 pan-head machine bolts with matching  
nuts and washers, and a 5/32  
self-tapping screws and a 1/16  
"
drill bit; or three #8 pan-head,  
drill bit.  
"
10  
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INSTALLING YOUR FISHFINDER > INSTALLING THE FISHFINDER UNIT  
To mount the bracket assembly:  
1. Using the tilt mount bracket (Fishfinder 90) or the  
swivel base (Fishfinder 140; Fishfinder 90 option)  
as a template, mark the location of the three holes  
that you use to secure the bracket to the mounting  
surface.  
To install the Fishfinder on the mount bracket:  
1. Align the slot on the back of the Fishfinder with the  
long mounting knob, and slide the Fishfinder into  
place. If necessary, adjust the long knob to spread  
the bracket arms apart. (Turn counter-clockwise to  
widen the bracket arms and clockwise to tighten.)  
2. If securing the base with machine bolts, drill three  
5/32" holes at the locations you marked; or, if  
2. Adjust the Fishfinder angle, and tighten the long  
mounting knob until snug.  
securing the base using self-tapping screws, drill  
1/16" starter holes at the locations you marked. Drill  
starter holes no deeper than half the screw length.  
3. For the Fishfinder 140 (Fishfinder 90 option), rotate  
the swivel mount bracket by twisting it left or right.  
The bracket clicks as you turn it. Select a good  
viewing angle, and then tighten all knobs.  
3. Secure the tilt mount bracket or swivel base with  
three bolts or screws. DO NOT OVERTIGHTEN.  
4. If you are using the swivel mount, place the swivel  
mount bracket over the swivel base and secure it  
with the short knob.  
Swivel mount bracket  
Tilt mo
Swivel base  
(Fishfinder 140;  
Fishfinder 90 option)  
(Fishfinder 90)  
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INSTALLING YOUR FISHFINDER > INSTALLING THE WIRING HARNESS  
3. Install the black (-) wire on the negative fuse holder  
or battery terminal.  
Installing the Wiring Harness  
The Fishfinder comes with a wiring harness that connects  
the Fishfinder to power and the transducer with one  
easy-to-remove connection. If it is necessary to extend the  
power wires, use 22 AWG wire. DO NOT cut the transducer  
cable, because this voids your warranty. If your boat has an  
electrical system, you might be able to wire the Fishfinder  
directly to an unused holder on your current fuse block. If  
you are using the boat’s fuse block, remove the in-line fuse  
holder supplied with the Fishfinder. You can also wire the  
Fishfinder directly to the battery.  
4. Install a 2 Amp fuse in the fuse holder (fuse block  
only).  
5. Align the notches on the cable plug and on the back  
of the Fishfinder. Insert the cable into the connector  
and turn the lock ring counter-clockwise until it stops.  
CAUTION: The Fishfinder input voltage is 10–18  
volts DC. Do not exceed this voltage, because this can  
damage the Fishfinder and void the warranty.  
To install the wiring harness:  
1. Determine the polarity of the power source using a  
test light or volt meter.  
2. Install the red (+) wire on the positive fuse holder or  
battery terminal.  
12  
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INSTALLING YOUR FISHFINDER > TESTING THE TRANSOM MOUNT INSTALLATION  
To test the transom mount installation:  
1. Begin testing the installation at a slow speed. If the  
sonar appears to be working properly gradually  
increase the boat’s speed observing the sonar’s  
operation. If the sonar signal suddenly is lost or the  
bottom return is severely degraded, note the speed  
at which this occurs.  
Testing the Transom Mount  
Installation  
Perform this test after you install the Fishfinder. Because  
you need water to carry the sonar signal, the Fishfinder  
does not function properly with the transducer out of the  
water. When you place your boat in the water, CHECK FOR  
LEAKS around the screw holes that are below the water  
line. DO NOT leave your boat in the water for an extended  
period of time without checking for leaks.  
2. Return the boat to the speed at which the signal was  
lost. Make moderate turns in both directions, and  
see if the signal improves.  
3. If the signal strength improves while turning, adjust  
the transducer so that it extends another 1/8"  
below the transom of the boat. It might take several  
adjustments to eliminate the degradation.  
4. If the signal does not improve, it might be necessary  
to move the transducer to a different location.  
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OPERATING YOUR FISHFINDER > UNDERSTANDING BASIC FUNCTIONS  
Understanding Basic Functions  
OPERATING YOUR FISHFINDER  
To turn on the Fishfinder:  
Press and release the Power key.  
To turn off the Fishfinder:  
Press and hold the Power key.  
Arrow keys—the up and down Arrow  
keys select an item on a menu. Only  
the Fishfinder 140 has the right and left  
Arrow key that cycles through the Main  
menu options.  
To change the backlight level:  
Press the Power key repeatedly to cycle between off,  
low, and high.  
To view or change settings for your Fishfinder, use the Main  
menu and the Setup menu.  
ENTER key—confirms a selection.  
To change a setting:  
ENTER  
1. Press MENU. The Main menu appears.  
2. Use the Arrow keys to move the selection arrow to  
an option, and press ENTER. The settings appear.  
MENU  
MENU key—shows or exits a menu.  
If you select Setup, the Setup menu appears. See  
“Using the Setup Menu” on page 16.  
Power key—turns the Fishfinder on or  
off and controls the screen backlight.  
(Fishfinder 140 is shown.)  
14  
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OPERATING YOUR FISHFINDER > USING THE MAIN MENU  
3. To select a setting, use the Arrow keys to move the  
selection arrow, and press ENTER. (When you reach  
the end of a menu, the selection arrow wraps to the  
beginning.) Press and hold an Arrow key to rapidly  
advance the selection speed.  
To quickly change a setting for the current option  
that appears in the upper-left corner of the screen (for  
example, the Range option in the above screen), press  
an Arrow key.  
Options and Settings  
4. To close a setting or a menu, press MENU.  
The following settings reset to the system defaults each time  
you turn on the Fishfinder.  
Using the Main Menu  
From the Main menu, you can change the Range, Gain,  
Scroll, Zoom, and View settings.  
Range—sets the maximum depth that you want the  
Fishfinder to display. Auto (default) automatically tracks  
the bottom, or you can set the range, 5–600 feet.  
To view the current menu settings, press MENU.  
Gain—controls the sensitivity of the Fishfinder’s sonar  
receiver. Auto (default) automatically sets the sonar  
sensitivity, or you can set the gain. To see more detail on the  
screen, increase the receiver sensitivity by selecting a higher  
gain. If there is too much detail or if the screen is cluttered,  
lower the sensitivity (lower the gain) to increase the clarity  
of the screen.  
To exit any window, press MENU.  
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OPERATING YOUR FISHFINDER > USING THE SETUP MENU  
Scroll—sets the rate that the graph scrolls from right to  
left. If you are sitting still or the graph is moving too fast,  
slowing or pausing the graph can help. The settings are  
Ultra, Fast (default), Medium, Slow, and Paused.  
Using the Setup Menu  
To access the Setup menu:  
1. Press MENU. The Main menu appears.  
2. Use the Arrow keys to move the selection arrow to  
Setup, and press ENTER. The options appear.  
Zoom—sets the zoom level for the screen. Off is the  
default.  
Options and Settings  
View—when you select a 2X or 4X Zoom setting, you  
can select a specific area to view on the screen. You can  
also allow the Fishfinder to automatically select a zoomed  
viewing area based on the bottom.  
Your changes to the following settings are used until you set  
the System Defaults option to Yes.  
Alarms  
Battery—controls an alarm that sounds when the battery is  
reaching a critical state of discharge. The settings are  
Off (default) and 8.516.0 volts remaining.  
Shallow—sets an alarm for the shallow water warning at a  
specific depth. The settings are Off (default) and 1.0–600  
feet.  
Deep—sets an alarm for the deep water warning at a  
specific depth. The settings are Off (default) and 1.0–600  
feet.  
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OPERATING YOUR FISHFINDER > USING THE SETUP MENU  
Fish—turns on or off (default) an alarm that sounds when  
the Fishfinder detects what it determines to be a fish.  
Beam—controls the angle of the transducer beam. Wide  
beam allows you to see more fish in shallow water, even off  
the sides of the boat. You can also choose Narrow (default)  
beam.  
Graphs  
Fish ID—sets how the Fishfinder shows underwater  
targets and background information. If you select a  
fish symbol, the screen shows only the information  
related to that symbol (large, medium, and small sizes).  
When using wide beam, fish symbols that are to the  
sides of the boat appear hollow. Those that are directly  
below the boat appear as solid black fish symbols.  
Whiteline—sets how the Fishfinder shows information  
about the bottom type.  
Off—the bottom return appears as solid black.  
(default) the Fishfinder does not interpret the sonar  
return data. Fish appear as arches  
Whiteline On  
Whiteline Off  
Suspended targets appear as symbols. No background  
information appears  
On (default)—the bottom return appears as a  
grayscale pattern and can help to determine bottom  
hardness. A hard bottom displays a thicker bottom  
layer. A soft bottom appears as a thinner bottom layer.  
Same as previous with the target depth shown.  
Suspended targets appear as symbols. Background  
information appears, making the distinction between fish  
and structure easier.  
Same as previous with target depth shown.  
Fishfinder 90/140 Owner’s Manual  
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OPERATING YOUR FISHFINDER > USING THE SETUP MENU  
Auto Gain—controls the aggressiveness of the Auto Gain.  
The higher the setting, the greater the number of targets  
appear on the screen. The lower the setting, the less clutter  
on the screen. The settings are High, Medium (default), and  
Low.  
Units  
Depth—sets the measurements in Feet (default), Meters, or  
Fathoms.  
Temperature—sets the water temperature units. The  
settings are Fahrenheit (default) and Celsius.  
Numbers  
System  
Size—sets the appearance of depth, temperature, and battery  
numbers. The settings are Small and Large (default).  
Simulator—controls the simulator mode. The settings are  
Off and On (default). See page 4 for more information.  
Battery—sets whether the current battery voltage appears  
on the screen. The settings are Hide (default) and Show  
Language—sets your language choice.  
Beeper—controls all Fishfinder sounds. The settings are  
Off and On (default).  
Water Temperature—sets whether the water temperature  
appears on the screen. This appears only if you have a  
temperature-capable transducer. The settings are Hide and  
Auto (default).  
Contrast—adjusts the contrast of the screen to compensate  
for light levels or viewing angles. Use the Arrow keys to  
increase or decrease the screen contrast.  
Defaults—restores all default settings.  
18  
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APPENDIX > SPECIFICATIONS  
Internal memory backup to retain user settings  
APPENDIX  
Input: 10 to 18 VDC with high voltage protection  
Sonar Power Output: 100 watts (RMS), 800 watts (peak-to-peak)  
Frequency: 80 kHz (wide) and 200 kHz (narrow)  
Specifications  
Fishfinder 90  
Size: 4.7" W x 4.9" H x 2.43" D (11.9 x 12.4 x 6.1 cm)  
Depth: 600 foot max depth. (Depth capacity is dependent on water  
salinity, bottom type, and other water conditions.)  
Weight: 15.5 oz (.439 kg)  
Specifications are subject to change without notice.  
Display: 2.0" W x 3.3" H (5.0 x 8.4 cm), 3.9" (9.9 cm) diagonal,  
64 x 128 pixels, black-and-white FSTN display  
Optional Accessories  
Usage: 3.5 watts maximum, Nominal: 12 VDC @ 0.15 Amps  
Purchase the following optional accessories on the Garmin Web site:  
Fishfinder 140  
Size: 6.1" W x 4.9" H x 2.6" D (15.5 x 12.5 x 6.6 cm)  
Swivel mount for the Fishfinder 90—allows your Fishfinder 90 to  
tilt and swivel on its mounting bracket.  
Weight: 18.7 oz. (.530 kg)  
Portable case with battery pack and suction mount transducer—  
makes your Fishfinder portable, so that it can go on any boat, with no  
installation (requires eight D-cell batteries, not included).  
Display: 3.2" W x 3.1" H (8.1 x 7.9 cm), 4.7" (9.9 cm) diagonal,  
128 x 240 pixels, 4-level gray scale FSTN display  
Flush mounting kit—mounts your fishfinder flush on the bulkhead  
or cabin wall. Press the side clips to release the Fishfinder so you can  
take it with you.  
Usage: 8 watts maximum, Nominal: 12 VDC @ 0.5 Amps  
Fishfinder 90 and Fishfinder 140  
Case: Fully Gasketed, high-impact plastic alloy Waterproof: IEC 529,  
level IPX-7 (submerged to 1 meter for 30 minutes)  
Protective cover—protects your product when you are not using it.  
Temperature Range: +5°F to 158°F (-15°C to 70°C)  
Fishfinder 90/140 Owner’s Manual  
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APPENDIX > CARING FOR THE FISHFINDER  
WARNING: The Fishfinder screen is coated with a  
special anti-reflective coating which is very sensitive  
to skin oils, waxes, and abrasive cleaners. CLEANERS  
CONTAINING AMMONIA WILL HARM THE  
ANTI-REFLECTIVE COATING. It is very important to  
clean the screen using an eyeglass lens cleaner which is  
specified as safe for anti-reflective coatings and a clean,  
lint-free cloth.  
Caring for the Fishfinder  
The Fishfinder case is constructed of high quality materials  
and does not require user maintenance except cleaning.  
Cleaning the Case  
Clean the Fishfinder’s outer casing (except for the screen)  
using a cloth dampened with a mild detergent solution, and  
then wipe it dry. Avoid chemical cleaners and solvents that  
may damage plastic components.  
Storage  
Do not store the Fishfinder where prolonged exposure to  
temperature extremes may occur (such as in the trunk of a  
car), because permanent damage may result.  
Cleaning the Screen  
The Fishfinder screen should be cleaned using a soft, clean,  
lint-free cloth. Water or eyeglass cleaner can be used if  
needed. If these are used, apply the liquid to the cloth and  
then gently wipe the screen with the moistened cloth.  
Water Immersion  
The Fishfinder is waterproof to IEC Standard 60529 IPX7.  
It can withstand immersion in 1 meter of water for 30  
minutes. Prolonged submersion can cause damage to the  
Fishfinder. After submersion, be certain to wipe and air dry  
the Fishfinder before reuse.  
20  
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APPENDIX > SOFTWARE LICENSE AGREEMENT AND LIMITED WARRANTY  
Software License Agreement  
BY USING THE FISHFINDER, YOU AGREE TO BE BOUND  
BY THE TERMS AND CONDITIONS OF THE FOLLOWING  
SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS  
AGREEMENT CAREFULLY.  
Limited Warranty  
This Garmin product is warranted to be free from defects in materials  
or workmanship for one year from the date of purchase. Within  
this period, 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, provided that  
the customer shall be responsible for any transportation cost. This  
warranty does not cover failures due to abuse, misuse, accident or  
unauthorized alteration or repairs.  
Garmin grants you a limited license to use the software embedded in  
this device (the “Software”) in binary executable form in the normal  
operation of the product. Title, ownership rights, and intellectual  
property rights in and to the Software remain in Garmin.  
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.  
You acknowledge that the Software is the property of Garmin and  
is protected under the United States of America copyright laws and  
international copyright treaties. You further acknowledge that the  
structure, organization, and code of the Software are valuable trade  
secrets of Garmin and that the Software in source code form remains  
a valuable trade secret of Garmin. You agree not to decompile,  
disassemble, modify, reverse assemble, reverse engineer, or reduce  
to human readable form the Software or any part thereof or create  
any derivative works based on the Software. You agree not to export  
or re-export the Software to any country in violation of the export  
control laws of the United States of America.  
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY  
INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL  
DAMAGES, WHETHER RESULTING FROM THE USE,  
Fishfinder 90/140 Owner’s Manual  
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APPENDIX > LIMITED WARRANTY  
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.  
Online Auction Purchases: Products sold through online auctions  
are not eligible for rebates or other special offers from Garmin.  
Online auction confirmations are not accepted for warranty  
verification. To obtain warranty service, an original or copy of the  
sales receipt from the original retailer is required. Garmin will not  
replace missing components from any package purchased through an  
online auction.  
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.  
International Purchases: A separate warranty is provided by  
international distributors for units purchased outside the United  
States. This warranty is provided by the local in-country distributor  
and this distributor provides local service for your unit. Distributor  
warranties are only valid in the area of intended distribution. Units  
purchased in the United States or Canada must be returned to the  
Garmin service center in the United Kingdom, the United States,  
Canada, or Taiwan for service.  
To obtain warranty service, contact your local Garmin authorized  
dealer or call Garmin Product Support for shipping instructions and  
an RMA tracking number. The unit should be securely packed with  
the tracking number clearly written on the outside of the package.  
The unit should then be sent, freight charges prepaid, to any Garmin  
warranty service station. A copy of the original sales receipt is  
required as the proof of purchase for warranty repairs.  
The Garmin Fishfinder has no user-serviceable parts. Should you ever  
encounter a problem with your unit, please take it to an authorized  
Garmin dealer for repairs.  
Garmin International, Inc.  
1200 E 151st Street, Olathe, Kansas 66062 USA  
Tel. 913/397.8200, Fax. 913/397.8282  
The Fishfinder is fastened shut with screws. Any attempt to open the  
case to change or modify the unit in any way will void your warranty  
and may result in permanent damage to the equipment.  
Garmin (Europe) Ltd.  
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51  
9DL UK  
Tel. 44/0870.8501241, Fax 44/0870.8501251  
22  
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APPENDIX > DECLARATION OF CONFORMITY (DOC)  
Tell Us What You Think  
Declaration of Conformity (DoC)  
Hereby, Garmin, declares that this Fishfinder 90/140 is  
in compliance with the essential requirements and other  
relevant provisions of Directive 1999/5/EC.  
Tell us how you like this manual! Fill out the Product  
Documentation Survey. Go to www.garmin.com/contactUs/,  
and click Product Documentation Survey.  
To view the full Declaration of Conformity, see the Garmin  
Web site for your Garmin product: http://www.garmin.  
ff140/. Click Manuals, and then select the Declaration of  
Conformity link.  
Fishfinder 90/140 Owner’s Manual  
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INDEX  
setup 16  
menu key 14  
mounting the bracket assembly  
mounting the transducer on a  
transom 9  
C
H
INDEX  
cleaning the case and screen 20  
clutter 4  
hardness of the bottom 3  
A
I
contrast setting 18  
accessories 19  
alarms 16  
installing  
D
the Fishfinder unit 10  
the transducer 6  
the unit on the mount bracket  
the wiring harness 12  
your Fishfinder 5  
battery 16  
deep 16  
defaults setting 18  
depth units 18  
dual beam 2  
mounting the transducer on a  
trolling motor 6  
fish 17  
N
shallow 16  
Anti-reflective coating 20  
arches 4  
E
narrow beam 2  
numbers 18  
battery 18  
enter key 14  
K
key  
assembling the transducer 6  
F
water temperature 18  
fish alarm 17  
fish ID graph 17  
fish symbols 4  
B
arrow 14  
enter 14  
menu 14  
O
backlight 14  
optional accessories 19  
battery alarm 16  
battery number 18  
Beam 2, 17  
beeper setting 18  
bottom of the water 3  
bracket assembly 10  
G
gain 15  
gain setting 4  
graphs 17  
auto gain 18  
beam 17  
P
L
packing list 5  
product registration v  
language setting 18  
limited warranty 21  
location, installation 10  
R
range 15  
M
fish ID 17  
Whiteline 17  
menu  
main 15  
24  
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INDEX  
assembling 6  
installing 6  
S
scroll 16  
mounting on a transom 7  
mounting on a trolling  
motor 6  
selecting a transom mount  
location 7  
setting, changing a 14  
setup menu 16  
transom mount installation 13  
setup menu option 14  
shallow alarm 16  
simulator mode 4  
simulator setting 18  
size, number 18  
software license agreement 21  
Sonar 1  
U
units 18  
depth 18  
temperature 18  
V
view 16  
sound waves 1  
specifications 19  
storage 20  
strongest sonar returns 3  
surface clutter 4  
swivel mount bracket 11  
W
warning statement vi  
warranty, limited 21  
water immersion 20  
water temperature number 18  
weakest sonar returns 3  
whiteline 17  
T
temperature number 18  
temperature units 18  
testing the transom mount  
installation 13  
wide beam 2  
wiring harness 12  
Z
transducer 1  
zoom 16  
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For the latest free software updates (excluding map data) throughout the life of your  
© 2006 Garmin Ltd. or its subsidiaries  
Garmin International, Inc.  
1200 East 151st Street, Olathe, Kansas 66062, USA  
Garmin (Europe) Ltd.  
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL, UK  
Garmin Corporation  
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan  
www.garmin.com  
Part Number 190-00582-00 Rev. B  
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