Fishnder 240 Blue

owners manual

FF 240 Blue covers.indd

02/19/02, 11:37 AM

2001 GARMIN Corporation GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282 GARMIN (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K. Tel. 44/1794.519944 Fax 44/1794.519222 GARMIN Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan Tel. 886/2.2642.9199 Fax 886/2.2642.9099 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 web site (www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other GARMIN products. GARMIN, DCG, and See-Thru are registered trademarks and Fishnder 240 Blue is a trademark of GARMIN Corporation and may not be used without the express permission of GARMIN Corporation. February 2002 Part Number 190-00200-00 Rev. B Printed in Taiwan
Thank you for choosing the GARMIN Fishnder 240 Blue. This product is designed for easy operation and to provide years of reliable service. Please take the time to read this Owners Manual, and learn the operation of your new unit. This will help ensure that you get the most from the Fishnder 240 Blue. If you encounter a problem, or just have a question, contact our Product Support Department at 913-397-8200 or 800-800-1020, Monday Friday 8:00 a.m. to 5:00 p.m. Central Time. Enjoy your new Fishnder 240 Blue and once again thank you for choosing GARMIN.
Introduction Customer Service Product Registration
Help us better support you by completing our on-line registration today! Have the serial number of your Fishnder 240 Blue handy and connect to our web site (www.garmin.com). Look for the Product Registration link on the Home page. Why should you register your Fishnder 240 Blue? Notication of product updates Notication of new products Lost or stolen unit tracking

190-00200-00_B.indd

02/19/02, 11:28 AM
Introduction Limited Warranty
GARMIN Corporation warrants this product to be free from defects in materials and manufacture for one year from the date of purchase. GARMIN will, at its sole option, repair or replace any components that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor. The customer is, however, responsible for any transportation costs. This warranty does not cover failures due to abuse, misuse, accident or unauthorized alteration or repairs. 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 or 800-800-1020) 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 Fishnder 240 Blue Standard Package Includes: Fishnder 240 Blue Protective Front Cover Surface Mount Bracket with Knobs Power/Data Cable Owners Manual and Quick Reference Guide Label Dual Frequency Transom Mount Transducer (with depth/temp)* and separate Speed Sensor*
Introduction Packaging and Accessories
Optional Dual Frequency Transducers and Accessories: Plastic Transom Mount (with depth/temp)* Bronze Thru-Hull (depth only) Plastic Thru-Hull (depth only) Speed Sensor* Temperature Sensor 10 Transducer Extension Cable 20 Transducer Extension Cable Second Mounting Station Flush Mounting Kit Swivel Mount, 1 RAM Cigarette Lighter Adapter Power/Data Cable 18-Pin A/C PC Adapter (US) 18-Pin A/C PC Adapter (EURO) * Included with Optional Package
Introduction Table of Contents
Introduction... i-vi Customer Service... i Limited Warranty... ii Packaging and Accessories.. iii Unit Display... vi Installation...1-9 Transducers.... 1 Transom Mount Installation... 2 In-hull Installation... 3 Speed Sensor Installation.. 4 Wiring Harness Installation... 5 Wiring to a Fuse Block.. 5 Display Installation (Surface Mount).. 7 Display Installation (Flush Mount).. 8 Testing the Installation.. 9
Unit Operation...10-29 Keypad Functions... 10 Backlight... 10 Display Information... 11
Using the Adjustment Bar:
Range... 12 Zoom... 13 View.... 13 Gain.... 14

Setup Menu:

Chart Tab Frequency... 15 Fish Symbols... 16 Whiteline... 17 Scroll Speed... 17 Scale.... 18 Tools Tab Depth Line.... 18 Flasher... 19 Simulator... 19 Noise Reject... 19 Numbers Tab Number Size... 20 Battery Voltage.. 21 Temperature... 21 Speed... 22 Depth Number... 22
Alarms Tab Fish Alarm...23 Shallow Water..24 Deep Water...24 Battery Voltage...25 System Tab Contrast...25 Beeper...26 NMEA Output..26 Language...26 Calibrations Tab Keel Offset...27 Water Type....27 Calibrate Speed...27 Units Tab Depth...28 Temperature...28 Speed...28 Memory Tab Remember...29 Factory Setup...29 Software Version...29
On the Water.. 30-35 Understanding Sonar..30 Transducer Coverage..31 Understanding the Chart...32 Whiteline...33 Thermoclines...34 Simulator Mode...35 Appendix A: Specications. 36 Appendix B: Alarm Messages and Icons. 37 Appendix C: Index.. 38
Introduction What can the Fishnder 240 Blue Display?
The Fishnder 240 Blue is capable of displaying 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 or temperature sensor, the unit can display the water temperature.

Speed Over Water*

Installation Transducers

50 kHz

wide cone angle

narrow cone angle

200 kHz

dead zone fish not seen
Installation Mounting the Transducer
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 or any part of the transducer cable, as this will void your warranty. The cable cannot be spliced and connected to any existing (GARMIN or nonGARMIN) transducer cables. Following are some tips and basic installation instructions for the optional dual frequency transducer and speed sensor. Detailed installation instructions are provided in the transducer kits.
Transom Mount Installation
DO NOT mount the transducer behind strakes, struts, 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.
Dual Frequency Transom Mount Transducer (with depth/temp).
NOTICE: The Transom Mount Transducer and the Speed Sensor must be installed separately. These two devices may not be combined.
Apply marine sealant to all screw threads to prevent water from seeping into the transom.
Transducer should extend 1/8" below fiberglass hull or 3/8" below aluminum hull
Mount the transducer cable cover well above the waterline.
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.
Mount the transducer parallel with the bottom.

In-Hull Installation

To avoid drilling a hole to mount a thru-hull transducer, a transom mount transducer may be used with epoxy inside a boat (also called shootthru-hull installation). For a transducer to be mounted inside the hull (shoot-thru, not thru-hull), the boat must be berglass, no core (contact your boat manufacturer if you are unsure). Test by placing a small amount of water inside the hull, placing the transducer on top of the water, then verifying the accuracy of the locators versus the current water depth. If they are the same, use epoxy (non-silicone based) to afx the transducer to the inside of the hull. If using a temperature sensing transducer, the temperature displayed will reflect the hull temperature.

Selecting a Location

Power/Data er/Data Connection

(BLUE) NMEA Out

(RED) +10 to +15 VDC

2-Amp In-Line Fuse

Transducer

(BLACK) Ground

TRANSDUCER CONNECTION
Connecting a Transducer to Multiple Sensors

NMEA Device Power Source

02/19/02, 11:29 AM
Display Installation (Surface Mount)
The Fishnder 240 Blue can be mounted to a at surface using the supplied Surface Mount Bracket.
Surface Mounting the Display:
1. Position the Surface Mount Bracket 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 Bracket using the mounting fasteners. 5. Slip the unit into the Surface Mount Bracket. 6. Tighten the knobs to secure the unit to the bracket.
Installation Installing the Display

Mounting Bracket

The Surface Mount Bracket is designed to be secured using a at head screw. If you use a screw with a countersunk head, you risk damaging the Surface Mount Bracket.

Surface Mount Bracket

Display Installation (Flush Mount)
The Fishnder 240 Blue can be mounted ush against a dash or electronics rack that is no more than 1/4 thick.
Flush Mounting the Display:
1. Remove the Mounting Bracket from the back of the unit by removing its four screws. 2 Using the Mounting Bracket as a template, mark the location of the four mounting holes and the center relief hole. 3. Drill the mounting holes using a 6mm or 15/64 drill. 4. Using a 1-7/8 hole saw, cut the center relief.
Be careful not to install screws that are too long! The mounting holes in the unit are approximately 1/4 deep. Installing screws that are too long will damage the unit and void the warranty.
5. Secure the unit to the mounting surface using four M5 screws.
If you are ush mounting the unit on a sheet metal surface, use the mounting bracket on the back to help reinforce the metal. You may also purchase the optional Flush Mounting Kit and follow the ush mounting instructions included with the kit.

Testing the Installation

While it is possible to perform some checks with the boat trailered, the boat should be in the water to properly test the installation. Press the POWER button and the Fishfinder 240 Blue 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 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.
Installation Testing the Installation
Simulator Message and Icon
To test the transducer and speed sensor installation, gradually increase the boats speed while checking the unit operation. If the unit displays intermittently or fails to display, verify that the transducer and speed sensor are aligned parallel with the bottom. If necessary, adjust their heights until the unit operates correctly. It may be necessary to make several adjustments to ensure proper operation throughout the speed range. If the signals do not improve, it may be necessary to move the transducer or speed sensor to a different location.
If the Fishnder 240 Blue is in Simulator Mode, the message Simulator On will be displayed along the bottom of the screen. The message will be replaced by the S icon indicating that the unit is running in simulator mode.
When adjusting the depth of the transducer, make the adjustments in small increments, like 1/8. Placing the transducer or speed sensor too deep can adversely affect the boats performance and increase the risk that they may strike underwater objects.
Unit Operation Keypad Functions

Arrow Keys

The ARROW keys are used to select items on the Adjustment Bar and Setup Menu and to change eld data.

Enter Key

The ENTER key is used to activate/deactivate the Adjustment Bar and Setup Menu data elds for review or change.

Setup Key

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

Power and Backlight 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 on or off. Pressing the POWER key briey will activate the Backlight Adjustment Window. The backlight has three settings: Off, User Dened and Full Brightness. With the Backlight Adjustment Window displayed and the backlight Off, pressing the POWER key will cycle the backlight to the User Dened setting. Pressing it again will cycle the backlight to its maximum brightness. Pressing it again will turn the backlight Off. With the Backlight Adjustment Window displayed, press the Up or Down ARROW key to set the User Dened level. This will increase or decrease the backlight brightness. When the backlight is adjusted to your desired setting, press the ENTER key to hide the adjustment window.

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 Speed Over Water, the Fishfinder 240 Blue requires an additional speed sensor. The Depth Scale and the Flasher are displayed from top to bottom along the right side of the display. Messages and Alarm Icons are displayed along the bottom.
Unit Operation Describing The Display

Adjustment Bar Depth

If the unit is unable to track the bottom for any reason, the digits in the depth window will ash on and off to alert the user that the unit is not tracking the bottom.
Battery Voltage Water Temperature Speed Over Water Depth Scale Depth Line Flasher Transducer Frequency Alarm/Message Icons

Using the Adjustment Bar

Unit Operation The Adjustment Bar

Current Setting

The Adjustment Bar allows direct access to the most commonly changed settings. These include the Depth Range, Zoom setting, and the Gain (sensitivity) of the unit. 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.

Adjustment List

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 depth range.

To select a Depth Range:

1. Highlight Range on the Adjustment Bar. 2. Using the UP or DOWN Arrow, place the pointer at the desired depth range.

Range Adjustment

To set 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.
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.
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 allows 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 select a Frequency:

1. Highlight the Chart tab on the Setup Menu. 2. Highlight the Frequency selection eld and press ENTER. 3. Using the UP or DOWN Arrow, choose 200kHz, 50kHz or Dual and press ENTER. The selected frequency will be displayed in the bottom left-hand corner of the chart.

Fish Symbols

All available information will be displayed.
Suspended targets displayed as symbols. In this mode,
background information will still be displayed making sh identication easier.
Same as above, with target depth displayed.
Fish Symbols allows the user to determine how the chart will display underwater targets and background information. If Fish Symbols is 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 Symbols selection eld and press ENTER. 3. Using the UP or DOWN Arrow, select the desired symbol and press ENTER.
Suspended targets displayed as symbols. No background
information will be displayed in this mode.
NOTE: When the frequency is set to Dual, the appearance of the sh symbols will change. Fish returns from the center of the beam will be black, but the sh returns from the edges of the beam will be clear.

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. The degree of gray-scale can be used to determine bottom hardness. See page 33 for more details on this feature.
To change the Whiteline Setting:
1. Highlight the Chart tab on the Setup Menu. 2. Highlight the Whiteline selection eld and press ENTER. 3. Choose On or Off and press ENTER to accept the selection.
Fish Symbols in Dual Frequency Mode

Scroll Speed

You can adjust the speed that the chart scrolls from right to left by using the Scroll Speed selection eld. If you are sitting still or the chart is moving too fast, slowing the scroll rate can be benecial.
To adjust the Scroll Speed:
1. Highlight the Chart tab on the Setup Menu. 2. Highlight the Scroll Speed selection eld and press ENTER. 3. Choose Fast, Medium, Slow or Pause, then press ENTER to accept the selection.

Whiteline Selections

Unit Operation Setup Menu: Chart/Tools Tabs
The depth Scale is displayed vertically along the right side of the chart. The depth Scale can be configured to display in four different modes: as an Overlay, in the Corners, as a Basic Scale, or with No Scale.
To change the Scale Setting:
1. Highlight the Chart tab on the Setup Menu. 2. Highlight the Scale selection eld and press ENTER. 3. Choose Overlay, Corners, Basic or No Scale, then press ENTER to accept the selection.

Scale Overlay

Scale Corners
Tools Tab The Tools tab contains the Depth Line, Flasher, Simulator and Noise Reject tools. The Depth Line tool is used to quickly identify a set depth or to 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 to 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:
Scale Basic Scale No Scale
1. Highlight the Tools tab on the Setup Menu. 2. Highlight the Depth Line selection 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, press ENTER to accept the change.
Unit Operation Setup Menu: Tools Tab

Flasher

With the Flasher tool active, a graphic Flasher representation will be displayed on the far right side of the chart. This graphic Flasher displays structure and bottom returns much the same as a true Flasher. You may find this feature particularly useful when using Fish Symbols.
To Turn the Graphic Flasher on and off:
1. Highlight the Tools tab on the Setup Menu. 2. Highlight the Flasher selection eld and press ENTER. 3. Select On or Off and press ENTER to accept the selection.

Simulator

The Simulator tool allows the unit to simulate the use of four different transducer configurations: Depth Only, Temp, Speed, or Temp and Speed. These choices allow the user to view more accurate depictions of actual unit operation. For details on using the simulator, see page 35.

Noise Reject

Depth Line Activated
The Noise Reject tool helps filter unwanted noise from the chart. The Noise Reject tool can be turned Off, set for Auto (automatic) adjustment or set for Manual adjustment.
Remember when setting the Noise Reject tool, the higher the noise rejection setting, the more likely the unit is to not show sh or structure. Continued on page 20
Graphic Flasher Activated

Noise Reject (continued)

Unit Operation Setup Menu: Tools/Numbers Tabs
To change the Noise Reject Setting:
1. Highlight the Tools tab on the Setup Menu. 2. Highlight the Noise Reject selection eld and press ENTER. 3. Choose Off, Auto, or Manual and press ENTER.
To manually adjust the Noise Reject Setting:
1. Select Manual in the Noise Reject eld of the Tools tab, then press ENTER. A slider will appear below the Noise Reject selection eld. 2. Use the Up or Down ARROW key to highlight the slider, then press ENTER. 3. Use the Left or Right ARROW key to manually adjust the Noise Reject to the desired setting, then press ENTER.
Noise Reject Manual Adjustment Slider
Numbers Tab The Numbrs (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 capable sensors. You can also set up how the unit finds the digital Depth Number. To access the Numbrs 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:
Normal Numbers Large Numbers
1. Highlight the Numbrs tab on the Setup Menu. 2. Highlight the Number Size selection eld and press ENTER. 3. Choose Normal or Large and press ENTER to accept the selection.
The Fishfinder 240 Blue can display the current battery voltage on the chart.
To show or hide the Battery Voltage display eld:

1. Highlight the Numbrs tab on the Setup Menu. 2. Highlight the Battery Voltage selection eld and press ENTER. 3. Choose Show or Hide and press ENTER to accept the selection.
Unit Operation Setup Menu: Numbers Tab

Temperature

The Fishfinder 240 Blue 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. The temperature field can be shown or hidden, regardless of the transducer installed.
To set the Temperature display eld:
1. Highlight the Numbrs tab on the Setup Menu. 2. Highlight the Temperature selection eld and press ENTER. 3. Choose Auto, Show or Hide, then press ENTER to accept the selection.
Battery Voltage Selections
Temperature Display Selections
The Fishfinder 240 Blue can display the boats Speed Over Water when equipped with a speed sensor. When set to Auto, the unit will automatically sense when a capable sensor is connected and display the boats speed.
To set the Speed display eld:
1. Highlight the Numbrs tab on the Setup Menu. 2. Highlight the Speed selection eld and press ENTER. 3. Choose Auto, Show or Hide, then press ENTER to accept the selection.

Depth Number

Speed Display Selections
The Depth Number setting refers to how the unit finds the digital depth number that is displayed in the upper left corner of the screen. When set to Auto, the unit will show the most accurate digital depth possible. However, this may cause the chart to update slower as the unit calculates the Auto depth. When set to From Chart (default), the unit finds the digital depth from the same image you see on the chart. The From Chart setting allows the chart to update faster than when the unit is set to Auto and is recommended when using the unit in deep water.

Depth Number Selections

NOTE: In From Chart mode, the Fishnder 240 Blue may not be able to get the digital Depth Number if the bottom is not visible on the chart. Adjust the Depth Range on the Adjustment Bar until the bottom is visible, or change the setting to Auto to get the digital Depth Number.

When activated, the Battery Voltage Alarm will warn you when the battery voltage reaches a user determined state of discharge.
To activate/deactivate the Battery Voltage Alarm:
1. Highlight the Alarm tab on the Setup Menu. 2. Highlight the Battery Voltage checkbox. 3. Pressing ENTER will insert or remove a check mark in the checkbox.
Unit Operation Setup Menu: Alarms/System Tabs
To set the Battery Voltage Alarm:
1. Highlight the Battery Voltage eld and press ENTER. 2. Use the Arrow Keys to input the desired voltage, then press ENTER to accept the setting.
System Tab The System tab contains the Contrast, Beeper, NMEA Output and Language setups. To access the System tab, use the arrow keys to highlight it.

Contrast

Battery Voltage Alarm
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 eld and press ENTER. 3. Using the Right/Left ARROW keys, move the slider Right to darken the screen, or Left to lighten the screen. When nished, press ENTER to accept the setting.

Contrast Adjustment

Beeper
Unit Operation Setup Menu: System Tab
The Beeper 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 eld and press ENTER. 3. Choose Off, Alarms Only, or Key & Alarm, then press ENTER to accept the setting.

NMEA Output

The Fishnder 240 Blue 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.

Beeper Selections

2. Highlight the NMEA Output eld and press ENTER. 3. Choose Off or On, then press ENTER to accept the setting.

Language

Chart information can be displayed in several different languages.

To select a Language:

1. Highlight the System tab on the Setup Menu. 2. Highlight the Language eld and press ENTER. 3. Use the Arrow Keys to select the desired language from the list and press ENTER to accept the setting.

Language Selections

Calibrations Tab The Calibrt tab contains the Keel Offset and Water Type setups, and a Calibrate Speed function for use when a speed sensor is installed.

Keel Offset

Unit Operation Setup Menu: Calibrations Tab
The Keel Offset 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 Calibrt tab on the Setup Menu. 2. Highlight the Keel Offset eld and press ENTER. 3. Use the Arrow Keys enter a new offset, then press ENTER to accept.

Water Type

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

02/19/02, 11:30 AM

Transducer Coverage
The area covered by the transmitted sound waves is determined by the cone angle of the transducer and the water depth. The 50kHz frequency provides a 40 cone angle, with a coverage width that is approximately 2/3 of the water depth. As shown in the sidebar, the 40 cone angle (50kHz frequency) approximately covers the area of a 20 foot diameter circle at a 30 foot depth. The 200kHz frequency provides a 10 cone angle, with a coverage width that is approximately 2/10 of the water depth. As shown, the 10 cone angle (200kHz frequency) approximately covers the area of a 6 foot diameter circle at a 30 foot depth. When using the Fishfinder 240 Blue in Dual frequency mode, the unit transmits both 50kHz and 200kHz signals at the same time. The Dual frequency capability of the Fishfinder 240 Blue allows the user to have a large coverage area and still retain good bottom resolution. When in Dual frequency mode the unit uses the 200kHz to display detailed bottom information, keeping Dead Zones to a minimum, and the 50kHz signal for the large coverage area. Fish returns from the 50kHz and 200kHz beams will appear differently on the display. The 50kHz beam tends to show longer fish returns than the 200kHz beam. The examples below show simulated fish returns at 50 and 200 kHz.
On the Water Transducer Coverage
200kHz - 10 Cone Angle 72" coverage at 30'
50kHz - 40 Cone Angle 20' coverage at 30'

200kHz

Understanding the Chart
On the Water 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 cannot determine from where the return originated. It can only determine when the return was received. Examples 1 and 2 provide a look at the underwater world from a top view, and illustrate how these views would be displayed on the chart. On both charts it appears the sh and tree are side by side as shown in Example 1. However, when we look at Example 2, we see that the sh can be several feet from the tree. It is important to remember that the Fishnder cannot determine where in the coverage area the tree or sh are, only that the returns were received at the indcated depths in the same time frame.

Backlight...10 Battery....37 Battery Voltage Alarm..25 Battery Voltage Display...21 Beeper....26 Bottom Structure... vi, 32-33
Gain Adjustment... 14 Graphic Flasher... 19
Calibrate Speed...27 Calibrations Tab...27 Chart Tab... 15-18 Contrast....25 Customer Service...i
In-Hull Installation... 3 Installing the Display..7-8 Installing the Speed Sensor... 4 Installing the Transducer...2-4 Installing the Wiring Harness...5-6
Keel Offset....27 Keypad....10
Scale.... 18 Scroll Speed... 17 Setup Key.... 10 Setup Menu...15-29 Shallow Water Alarm.. 24 Simulator... 19, 35 Software Version... 29 Specications... 36 Speed Calibration.... 27 Speed Display... 22 Speed Sensor Installation... 4 Speed Units... 28 Surface Mounting the Display... 7 System Tab....25-26
Language...26 Limited Warranty...ii
Memory Tab...29 Messages...37 Mounting the Display... 7-8 Mounting the Speed Sensor...4 Mounting the Transducer... 2-4
NMEA Output...26 Noise Reject...19 Number Size... 20-21 Numbers Tab... 20-23

Operation...30

Packaging...iii Power Key....10 Product Registration....i
Table of Contents... iv-v Temperature Display.. 21 Temperature Units... 28 Testing the Installation... 9 Thermocline... vi, 34
Range Adjustment....12 Remember Settings...29 Restore Factory Settings...29
Tools Tab...18-20 Transducers.... 1, 31 Transom Mount Installation... 2
Understanding Sonar.. 30 Understanding the Chart...32-34 Units Tab... 28

View Adjustment... 13

Warranty.... ii Water Depth... vi, 28 Water Temperature... vi, 28 Water Type.... 27 Whiteline... 17, 33 Wiring Harness Installation...5-6

Zoom Adjustment... 13

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2001-2002 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 Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan www.garmin.com Part Number 190-00200-00 Rev. B