Garmin Fishfinder 240 User Manual

Fishfi nder 240

owner’s
manual

© 2000 GARMIN Corporation

GARMIN International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, U.S.A.
Tel. [phone] or 800/800.1020
Fax [phone]

GARMIN (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.
Tel. [phone]
Fax [phone]

GARMIN (Asia) Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
Tel. [phone]
Fax [phone]

All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded
or stored in any storage medium, for any purpose without prior written consent of GARMIN Corporation. GARMIN Corporation hereby grants
permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed for personal use, provided
that such electronic or printed copy of this manual contains the complete text of this copyright notice and provided further that any unauthorized
commercial distribution of this manual is strictly prohibited.

Information in this manual is subject to change without notice. GARMIN
Corporation reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or
organization of such changes. Visit the GARMIN website (www.garmin.com) for current updates and supplemental information concerning the use
and operation of this and other GARMIN products.

GARMIN and Fishfi nder 100 are registered trademarks of GARMIN Corporation and may not be used without the express permission of GARMIN
Corporation.

August 2000 Part Number 190-00155-10 Rev. A Printed in Taiwan

Thank You for choosing the GARMIN Fishfi nder 240. This product is

designed for easy operation and to provide years of reliable service.

Please take the time to read this Owner’s Manual, and learn the opera­tion of your new unit. This will help ensure that you get the most from
the Fishfi nder 240.

If you encounter a problem, or just have a question, contact our
Product Support Department at 913-397-8200, Monday — Friday 8:00
a.m. to 5:00 p.m. Central Time.

Enjoy your new Fishfi nder 240 and once again thank you for choosing
GARMIN.

on-line registration today! Have the serial number
of your Fishfi nder 240 handy and connect to our
website (www.garmin.com). Look for the Product
Registration link on the Home page.

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.

Introduction

Customer Service

Product Registration

Help us better support you by completing our

Why should you register your Fishfi nder 240?

• Notifi cation of Product Updates

• Notifi cation of New Products

• Lost or Stolen unit tracking

NOTE: If you have previously registered your

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

Introduction

Limited Warranty

ii

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.

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 department
(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.

The Fishfi nder 240 Standard Package contains the following items:

• Fishfi nder 240

• Protective Front Cover

• Surface/Flush Mount Kit

• Wiring Adapter Cable

• Owner’s Manual

• Quick Reference Guide

• *Transom Mount Transducer (w/depth/temp)

* Optional

Optional Transducers:

010-10107-00 Bronze Thru-Hull (w/depth/temp)
010-10177-00 Bronze Thru-Hull (w/depth/temp/speed)
010-10119-00 Plastic Thru-Hull (w/depth)
010-10224-00 Plastic In-Hull (depth only)
010-10249-00 Plastic Transom Mount (w/depth/temp)
010-10200-00 Trolling Motor Mount (w/depth/temp)
010-10225-00 Remote Temperature Sensor
010-10252-00 Speed Sensor

Accessories:

010-10170-00 10’ Transducer Extension Cable
010-10170-01 20’ Transducer Extension Cable
010-10269-00 Protective Front Cover

Introduction

Packaging and Accessories

iii

Introduction.......................................................................... i-vi

Customer Service ............................................................................................... i

Introduction

Limited Warranty.............................................................................................. ii

Packaging and Accessories................................................................................ iii

Unit Display ......................................................................................................vi

Installation ...........................................................................1-9

Table of Contents

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

Unit Operation.................................................................10--27

Using the Adjustment Bar

Keypad Function............................................................................................. 10

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

iv

Temperature .................................................................................................... 21

Speed .............................................................................................................. 21

Alarms

Fish Alarm ..................................................................................................... 22

Shallow Water................................................................................................. 22

Deep Water ..................................................................................................... 23

Battery Voltage ................................................................................................ 23

System

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 ..........................................................................34-40

Appendix A—Specifi cations ............................................................................ 34

Appendix B—Alarm Messages and Icons......................................................... 35

Appendix C—Fishfi nder 240 Portable ....................................................... 36-37

Appendix D—Index ................................................................................... 38-40

Introduction

Table of Contents

v

Introduction

What can the Fishfi nder 240

Display?

The Fishfi nder 240 is able to display a variety of useful information
about the underwater environment. Below are a few things the unit will
help you see.

Water Depth

The unit displays water depth and can provide a warning for shallow
or deep-water conditions.

Battery Voltage

The unit can display the battery voltage that is available to the unit.

Water Temperature*

If equipped with a capable transducer, the unit can display the water
temperature.

Speed Over Water*

If equipped with a capable transducer or Speed Sensor, the unit can
display the boat’s speed over water.

Fish

The unit displays fi sh as arches or fi sh symbols and can alert you when
a fi sh is detected.

Thermocline and Structure

With GARMIN’s See-Thru® technology the Fishfi nder 240 can display
more than just the thermocline and structure, the unit displays fi sh
in and below the thermocline, trees, brush and deadfall like you have
never seen before!

Bottom Shape and Type

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.

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.

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.

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.

Selecting a Transducer

Wide cone angle

Narrow cone angle

dead zone

fish not seen

X

X

1

Installation

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.

Mounting the Transducer

DO NOT mount the transducer behind strakes,
struts, fi ttings, 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 calm, non turbulent water for
optimal performance.

2

Following are some tips and basic installation instructions for three popu­lar transducers. Detailed installation instructions are provided in the trans­ducer kits.

Transom Mount Installation

010-10248-00 (depth/temp) Transom Mount Transducer.

Apply marine sealant to all
screw threads to prevent water
from seeping into the transom.

OK

Mount the transducer parallel with the bottom.

Mount the transducer cable cover
well above the waterline.

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

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.

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.

Selecting a Location

The location has to be solid fi berglass, devoid of any air bubbles,

laminates, fi llers 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.

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.

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 signifi cantly degraded,

Apply twisting motion

another location will need to be tested.

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.

3. Weight the transducer in place and allow to cure for 24 hours.

Installation

Mounting the Transducer

PVC Pipe
or a Can

Strip Caulk or
RTV Sealer

Hull Surface

Testing the Location

Weight transducer in place

to eliminate any

trapped air bubbles

for at least 24 hours

Installing the Transducer

Weight
transducer to
hold it in place

Fill Pipe or Can
with water or a
light mineral oil

Slow cure two

part epoxy

Strip Caulk or
RTV Sealer

3

Installation

Mounting the Transducer

Worm Gear

Cable Ties

Clamp Band

Trolling Motor Installation

Included in the 010-10251-00 transducer kit you should have:

• Worm Gear Clamp

• Cable Ties

• 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.

3. Place the free end of the clamp band into the worm gear and tighten
until the band is through the 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.

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 slot in bracket

4

Wiring Harness Installation

The Fishfinder 240 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 compa­rable size and keep your extension as short as possible.

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
boat’s fuse block, remove the in-line fuse holder supplied with the unit.

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.

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. The Yellow (alarm) wire is not used, the Fishfi nder 240
does not support external alarms.

Continued on page 6

Installing the Wiring Harness

10-18 Volt Boat Supply

+

Install 2-Amp Fuse

2A

-

Boat Ground

Fishfi nder 240

Black Wire

Red Wire

5

Installation

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.

Installing the Wiring Harness

Power/Data
Connection

Speed Temp Transducer

Connecting a Transducer to Multiple Sensors

6

The Fishfi nder 240 can be connected to another piece of NMEA com­patible electronic equipment. If equipped with a capable transducer, the
Fishfi nder 240 sends depth, temperature and speed information that could
be displayed on another device.

2-Amp In-Line Fuse

Display Installation (Surface Mount)

The Fishfi nder 240 can be mounted to a fl at surface using the supplied

Surface Mounting Bracket.

Installation

Surface Mounting 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 fl at head screw.
If you use a screw with a countersunk head you risk damaging the Surface
Mount Bracket.

OK

Installing the Display

Surface Mount Bracket

7

Installation

Installing the Display

Display Installation (Flush Mount)

The Fishfi nder 240 can be mounted fl ush against a dash or electronics

rack that is no more than 1/4” thick.

Flush Mounting 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

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.

Press the Power button and the Fishfinder 240 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.

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.

Installation

Testing the Installation

9

Unit Operation

10

Keypad Function

Arrow Keys

The Arrow Keys are used to select items on the Adjustment Bar and
Setup menu and to change fi eld data.

Enter Key

The Enter key is used to activate/deactivate Adjustment Bar and Setup
Menu data fi elds for review or change

Setup Key

The Setup key is used to activate/deactivate Setup Menu.

Power Key

The Power Key is used to turn the unit on/off and to activate the display
backlight. Press and hold to turn the unit off. Press briefl y and release
to activate the backlight

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 240 requires additional
sensors capable of producing the particular data.

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.

The Fishfinder 240 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.

If the unit is unable to track the bottom for any reason, the digits in the depth
window will fl ash on and off to alert the user that the unit is not tracking the
bottom.

Unit Operation

Describing The Display

Adjustment Bar

Depth

Battery Voltage

Water Temperature

Speed Over Water

Depth Scale

Flasher

Alarm/Message Icons

11

Unit Operation

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.

Current Setting

Adjustment List

12

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.

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.

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 adjustment
list

Zoom

The Zoom Adjustment is used to quickly select a display zoom scale.

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.

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.

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.

Unit Operation

The Adjustment Bar

Zoom Adjustment

View Adjustment

13

Unit Operation

The Adjustment Bar

Gain

The Gain Adjustment allows the user to control the sensitivity of the
unit’s 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.

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.

14

Minimum Gain

Normal Gain Maximum Gain

Setup Menu

The Setup Menu contains the unit settings that should not require
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.

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

‘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.

To select a Fish Symbol:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Fish Symbol’ selection fi eld and press ENTER.

3. Using the UP or DOWN arrow select the desired symbol and press ENTER.

Unit Operation

Setup Menu/Chart

Fish Symbols

— All available information will be displayed.

— Suspended targets will display as symbols. In this mode

background information will still be displayed making
fi sh identifi cation easier.

— Same as above with target depth displayed.

— Suspended targets displayed as symbols. No background

information will be displayed in this mode.

— Same as above with target depth displayed.

15

Unit Operation

Setup Menu/Chart

Whiteline Selections

Whiteline

‘Whiteline’ controls how the unit displays information about the 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.

To Change the Whiteline Setting:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Whiteline’ selection fi eld 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 fi eld. If you are sitting still, or the chart is
moving too fast slowing the scroll rate can be benefi cial.

To Adjust the Scroll Speed:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Scroll Speed’ selection fi eld and press ENTER.

3. Choose ‘Fast’, ‘Medium’, ‘Slow’ or ‘Pause’, press ENTER to accept the
selection.

16

Scroll Speed Selections

If you are using the Fishfi nder 240 on the portable case battery power, slowing
the scroll rate will help to conserve your battery.

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:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Scale’ selection fi eld and press ENTER.

3. Choose ‘Overlay’, ‘Corners’, ‘Basic’ or ‘No Scale’, press ENTER to
accept the selection.

Scale —

Overlay

Scale —

Corners

Scale —

Basic

Setup Menu/Chart

Scale —

No Scale

17

Unit Operation

Setup Menu/Tools

Depth Line

Tools

The Tools tab contains the ‘Depth Line’, ‘Noise Reject’, ‘Flasher’, and
‘Simulator’ tools. The ‘Depth Line’ tool is used to quickly identify a set
depth or measure the depth of underwater objects. 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.

Depth Line

When the ‘Depth Line’ tool is activated, a Depth Line selection is added
to the Adjustment Bar.

To Activate the Depth Line:

1. Highlight the ‘Tools’ tab on the Setup Menu.

2. Highlight the ‘Depth Line’ selection fi eld and press ENTER.

3. Select ‘On’ and press ENTER.

To Change the Depth Line Setting:

1. Place the highlight over the Depth Line selection on the Adjustment Bar.

2. Use the UP or DOWN arrow to change the setting.

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.

18

Noise Reject Selections

Remember when setting the Noise Reject tool, the higher the noise rejection
setting, the more likely the unit is to not show fi sh or structure.

Unit Operation

To Change the Noise Reject Setting:

1. Highlight the ‘Tools’ tab on the Setup Menu.

2. Highlight the ‘Noise Reject’ selection fi eld and press ENTER.

3. Choose ‘Off’, ‘Auto’, ‘Low’, ‘Med’, or ‘High’, and press ENTER.

Flasher

With the ‘Flasher’ tool active, a graphic Flasher representation will be
displayed on the 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’.

To Turn the Graphic Flasher On and Off:

1. Highlight the ‘Tools’ tab on the Setup Menu

2. Highlight the ‘Flasher’ selection fi eld 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 240’s 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.

Setup Menu/Tools

Graphic Flasher Selections

Simulator Selections

19

Unit Operation

Setup Menu/Numbers

Numbers

The ‘NUM’ (Numbers) tab allows you to choose whether you would
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.

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 fi eld and press ENTER.

3. Choose ‘Normal’ or ‘Large’, press ENTER to accept the selection.

Normal Numbers

Battery Voltage Selections

20

Large Numbers

Battery Voltage

The Fishfinder 240 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 fi eld and press ENTER.

3. Choose ‘Show’ or ‘Hide’, press ENTER to accept the selection.

Temperature

The Fishfinder 240 can display the water temperature when equipped
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.

To Set the Temperature Display Field:

1. Highlight the ‘NUM’ tab on the Setup Menu.

2. Highlight the ‘Temperature’ selection fi eld and press ENTER.

3. Choose ‘Auto’, ‘Show’ or ‘Hide’, press ENTER to accept the selection.

Speed

The Fishfinder 240 can display the boat’s ‘Speed’ Over Water when
equipped with a speed capable transducer or Speed Sensor. When set
to ‘AUTO’ the unit will automatically sense when a capable transducer or
sensor is connected and display the Speed.

To Set the Speed Display Field:

1. Highlight the ‘NUM’ tab on the Setup Menu.

2. Highlight the ‘Speed’ selection fi eld and press ENTER.

3. Choose ‘Auto’, ‘Show’ or ‘Hide’, press ENTER to accept the selection.

Unit Operation

Setup Menu/Numbers

Temperature Display Selections

Speed Display Selections

21

Unit Operation

Alarms

The ‘Alarm’ tab allows you to activate and configure the four alarms
available in the Fishfinder 240. To access the ‘Alarm’ tab place the highlight
over it using the arrow keys. See page 35 for alarm icons and messages.

22

Setup Menu/Alarms

Fish Alarm Selections

Shallow Water Alarm

Fish Alarm

The ‘Fish Alarm’ can be confi gured to sound by fi sh 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 fi eld 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.

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.

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.

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.

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’ fi eld and press ENTER.

2. Using the arrow keys input the desired voltage, press ENTER to accept
the setting.

Setup Menu/Alarms

Deep Water Alarm

Battery Voltage Alarm

23

Unit Operation

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.

24

Setup Menu/Alarms

Contrast Adjustment

Beeper Selections

Contrast

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 fi eld and press ENTER.

3. Move the slider using the arrow keys, press ENTER to accept the setting.

Beeper

The ‘Beeper’ fi eld contains three settings: ‘Off’, ‘Alarms Only’, and ‘Key
& Alarm’.

To Change the Beeper Setting:

1. Highlight the ‘System’ tab on the Setup Menu.

2. Highlight the ‘Beeper’ fi eld and press ENTER.

3. Choose ‘Off’, ‘Alarms’, or ‘Key & Alarms’, press ENTER to accept the setting.

NMEA Output

The Fishfi nder 240 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 fi eld and press ENTER.

3. Choose ‘Off’, or ‘On’, press ENTER to accept the setting.

Calibration

Keel Offset

The ‘Keel Offset’ fi eld allows the user to offset the depth reading for a

keel or for the draw on a larger vessel .

To Set a Keel Offset:

1. Highlight the ‘Calibration’ tab on the Setup Menu.

2. Highlight the ‘Keel Offset’ fi eld and press ENTER.

3. Using the arrow keys enter a new offset, press ENTER to accept.

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 depth readings.

To Change the Water Type:

1. Highlight the ‘Calibration’ tab on the Setup Menu.

2. Highlight the ‘Water Type’ selection fi eld and press ENTER.

3. Choose ‘Fresh’ or ‘Salt’, press ENTER to accept the selection.

Speed Sensor

With a speed sensor installed, the ‘Calibrate Speed’ fi eld will become
available. This will allow you to calibrate the Fishfi nder speed to your boats
speedometer or your GPS speed.

To Calibrate the Speed:

1. Highlight the ‘Calibration’ tab on the Setup Menu.

2. Highlight the ‘Calibrate Speed’ button and press ENTER.

3. Run your boat, noting your top speed. Stop the boat and press ENTER.

4. With the speed fi eld highlighted, press ENTER and input your top speed.
Highlight ‘OK’ and press ENTER to fi nish the calibration.

Unit Operation

Setup Menu/Calibrations

Transducer at Surface

Enter (+) positive number to show
depth from bottom of keel

Transducer at Bottom of Keel

Enter (-) negative number to show
depth from surface

25

Unit Operation

Setup Menu/Units

Depth Selections

26

Temperature Selections

Speed Selections

Units

The ‘Units’ tab contains settings for ‘Depth’, ‘Temperature’ and ‘Speed’.

To access the ‘Units’ tab, use the arrow keys to highlight it.

Depth

The ‘Depth’ fi eld can be confi gured to display in Feet (ft), Meters (mt)

or Fathoms (fa).

To Select a Depth Unit:

1. Highlight the ‘Units’ tab on the Setup Menu.

2. Highlight the ‘Depth’ fi eld 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.

2. Highlight the ‘Temperature’ fi eld 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
boat’s ‘Speed’ Over Water. The unit can be confi gured 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’ fi eld and press ENTER.

3. Select ‘Miles’, ‘Kilometers’, or ‘Knots’, press ENTER to accept the

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.

Remember

The Fishfi nder 240 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’ fi eld 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.

Software Version

The ‘Software Version’ Button will report information about the current
software version in the unit, and display the ID Number.

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.

Unit Operation

Setup Menu/Memory

Remember Selections

Software Version Information

Reset to Factory Settings

27

On the Water

On the Water

Unit Operation and the Chart

1

2

2

1

3

This fi sh is currently in a Dead Zone and is not detected
by the sonar. The fi sh is in the coverage area of the
transducer, but remember the fi rst strong return sets the
bottom level. The fi sh will never be detected since the
bottom level will never be set below the fi sh. The fi sh on
the right side of the display (shown in light grey) will be
detected and displayed when the transducer cone passes
over the fi sh.

3

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 240 operates and how
it can help improve their fishing productivity.

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
underwater 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.

That is brief description of how your Fishfinder operates. Let’s take a
look at how this data can help you to improve your fishing.

28

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 Garmin’s 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

On the Water

Transducer Coverage

Coverage
Diameter

1'

2'

3'

4'

5'

6'
7'

8'

9'

10'

3'

6'

9'

12'

15'

18'

21'

24'

27'

30'

Example 1.

Depth

Coverage
Diameter

4"
10"
15"

20"
25"
30"

35"
40"

45"
45"

Depth

3'

6'

9'

12'

15'

18'

21'

24'

27'

30'

8° Transducer Coverage Chart

29

29

On the Water

On the Water

Understanding the Chart

Enlarged
Transducer
View

Remember that the Fishfi nder displays a 2D picture
of the underwater environment. The fi sh and tree
could be located anywhere in the coverage area at
that slice of time.

30

30

Branches

Fish

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.

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 fi sh and tree are side by side, but when we look at the scene
from the top we can see that the fi sh is several feet from the tree. It is
important to remember that the fi shfi nder can not determine where in the
coverage area the tree or fi sh are, only that the returns were received in
the same time frame.

Branches

Enlarged
Transducer
View

Example 2.

Fish

Whiteline

The Fishfi nder 240 can help you to determine if the bottom is hard
or soft. When the sonar soundwaves are refl ected 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.

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 diffi cult. 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.

Soft

Hard

Bottom

Bottom

On the Water

On the Water

Understanding the Chart

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.

Whiteline Turned Off

Whiteline

Example 3.

Whiteline Active

Structure is hard, probably a
rock or stump

Structure is soft, probably a
mud pile

31

31

On the Water

On the Water

Understanding the Chart

Thermoclines

One of the unique features offered by GARMIN is See-Thru® technol­ogy. See-Thru® technology allows the Fishfinder 240 to see through
thermoclines and helps locate fish where they live, and fish love the
thermocline.

A rough defi nition 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

32

Simulator Mode

The Fishfinder 240 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

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 240 can be controlled just as if
it were on the water.

The unit can be configured to act as if a variety of transducers are
installed while in the simulator mode.

To Select a Specifi c Transducer:

1. Press the Setup button on the face of the unit.

2. Using the arrow keys, highlight the ‘Tools’ tab then the ‘Simulator’
selection fi eld.

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 Mode

Simulator Message and Icon

Simulator Transducer Selections

33

33

On the Water

Appendix A

Specifi cations

Physical

Case: Fully Gasketed, high-impact plastic alloy

Display: 3.3” x 3.3” (8.3 x 5 cm) 240 H x 240 W pixels

Size: 4.625” H x 6.0” W x 2.75” D (11.7 x 15.2 x 7cm)

Weight: 24 oz.

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: 10 watts maximum

Nominal: 12 VDC @ 0.8 amps

Performance

Sonar Power Output: 400 watts (RMS), 3200 watts (peak to peak)

Frequency: 200 kHz

Depth 1200 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.

Specifi cations subject to change without notice.

34

34

Alarm Messages and Icons

The Fishfinder 240 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.

On the Water

Appendix B

Messages and Alarms

Battery Voltage Low

Deep Water Alarm

Shallow Water Alarm

Supply Voltage Low

Supply Voltage High

Unit Needs Repair

Unit Needs Repair

Memory Deleted

Increase Setting

Fish Alarm

35

35

Fishfinder 240 Portable

On the Water

Appendix C

Fishfi nder 240 Portable

Secure Fishfi nder 240 to the
boat using the provided eyelets

The Portable Case

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 Fishfi nder 240. The case is water resistant but is not designed to fl oat in
the event it should go overboard.

Use the two square eyelets located by the handle to secure the Fishfi nder 240
Portable Case to the boat.

The Suction Cup Transducer

Using the Portable unit you will still need to fi nd a suitable location for
the transducer. If you are in a slow moving boat such as a canoe or fl at
bottom boat, the mounting location is not as critical. Follow these simple
guidelines and you should be fi ne.

1. Look for clean (non-turbulent) water

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.

I

WARNING! Speeds in excess or 20 MPH may cause the
transducer to fl y off and strike occupants of the boat.

36

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.

On the Water

Appendix C

Batteries

The Fishfi nder 240 Portable comes with a D-Cell battery pack. Eight
D-Cell Alkaline batteries will provide approximately 20 hours of continu­ous 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.

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.

Installing a Gel Cell Battery:

Verify that the Gel-Cell battery has male spade connectors installed on

the positive and negative leads.

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

Fishfi nder 240 Portable

D-Cell and Optional Gel-Cell Battery Packs

Install the battery pack into the
moulded location in the
Portable case

37

37

38

38

On the Water

Appendix D

Index

A

Accessories ..................................................................................................... iii

Adjust the Scroll Speed .................................................................................. 16

Adjustment Bar ............................................................................................. 12

Alarms .................................................................................................... 22, 35

Arrow Keys .................................................................................................... 10

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

Depth Line ...................................................................................................... 18

Display ............................................................................................................vi

Display Installation.......................................................................................... 7

E

Enter Key ...................................................................................................... 10

F

Factory Setup ................................................................................................ 27

Fish Alarm .................................................................................................... 22

Fish Symbols ................................................................................................. 15

Fishfi nder 240 Portable ................................................................................. 36

Flasher .......................................................................................................... 19

Flush Mount ................................................................................................... 8

G

Gain . ............................................................................................................ 14

I

In-hull Installation .......................................................................................... 3

Installing the Display ....................................................................................... 7

K

Keel Offset ..................................................................................................... 25

Keypad.......................................................................................................... 10

L

Limited Warranty ............................................................................................ ii

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

On the Water

Appendix D

Index

39

39

On the Water

Appendix D

Index

S

Software Version ............................................................................................ 27

Specifi cations ................................................................................................ 34

Speed ....................................................................................................... 1, 26

Speed Sensor................................................................................................... 25

Suction Cup Transducer ................................................................................ 36

System ........................................................................................................... 24

T

Table of Contents ............................................................................................ iv

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

40

© 1999 - 2000 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 190-00155-10 Rev. A