Speed Over Water*

If equipped with a capable transducer or Speed Sensor, the unit can display the boats speed over water.
The unit displays sh as arches or sh symbols and can alert you when a sh is detected.
Thermocline and Structure
With GARMINs See-Thru technology the Fishnder 240 can display more than just the thermocline and structure, the unit displays sh in and below the thermocline, trees, brush and deadfall like you have never seen before!

Bottom Shape and Type

Garmins unique DCG (Depth Control Gain) system provides a clear graphic representation of the bottom type and its shape. * requires optional transducer or sensor

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. 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.
Installation Selecting a Transducer

Wide cone angle

Narrow cone angle

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, this will void your warranty. Following are some tips and basic installation instructions for three popular transducers. 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.
010-10248-00 (depth/temp) Transom Mount Transducer.
Apply marine sealant to all screw threads to prevent water from seeping into the transom.
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.
Mount the transducer parallel with the bottom.

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 berglass, devoid of any air bubbles, laminates, 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.
Weight transducer to hold it in place PVC Pipe or a Can Fill Pipe or Can with water or a light mineral oil
Many modern hulls have a prelocated pocket for In-hull transducer installation. If you are unsure if your hull is equipped with a prelocated pocket, contact your hull manufacturer.
Strip Caulk or RTV Sealer

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 signicantly degraded, another location will need to be tested.

Hull Surface

Apply twisting motion to eliminate any trapped air bubbles Weight transducer in place for at least 24 hours Slow cure two part epoxy
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.

08/16/00, 2:46 PM

Trolling Motor Installation
Included in the 010-10251-00 transducer kit you should have:
Worm Gear Clamp Cable Ties Transducer

Mounting the Transducer:

Cable Ties
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.

Worm Gear Clamp Band

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
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. 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

Installation Installing the Wiring Harness

10-18 Volt Boat Supply

Install 2-Amp Fuse
If your boat has an electrical system, it may be possible to wire the unit directly to an unused holder on your current fuse block. If you are using the boats fuse block, remove the in-line fuse holder supplied with the unit.
Installing the Wiring Harness:
1. Determine the polarity of the fuse holder using a Test Light or Volt Meter. 2. Install the Red (+) wire on the Positive Fuse Holder Terminal. 3. Install the Black (-) wire on the Negative Fuse Holder Terminal. 4. Install a 2 amp fuse in the Fuse Holder.

Boat Ground

Black Wire
During a typical installation, only the Red and Black wires are used. The Blue wire supplies NMEA data, and doesnt have to be connected for normal operation of the unit. The Yellow (alarm) wire is not used, the Fishnder 240 does not support external alarms.

Continued on page 6

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

Power/Data Connection

Transducer
Connecting a Transducer to Multiple Sensors

2-Amp In-Line Fuse

Display Installation (Surface Mount)
The Fishnder 240 can be mounted to a at surface using the supplied Surface Mounting Bracket.
Installation Installing the Display
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 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 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 Surface Mount Bracket and Knobs. 2 Cut a 4.3W x 4.35H 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

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.

Installation Testing the Installation
When adjusting the depth of the transducer, make the adjustments in small increments. Placing the transducer too deep can adversely affect the boats performance and place the transducer at greater risk of striking underwater objects.
Unit Operation Keypad Function

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 Adjustment Bar and Setup Menu data 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 briey 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.
Unit Operation Describing The Display

Adjustment Bar Depth

Water Temperature
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.
Speed Over Water Depth Scale Flasher

Alarm/Message Icons

Unit Operation The Adjustment Bar

Current Setting

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. 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.
The Range Adjustment is used to set the display depth range. The unit can be set to automatically track the bottom or set to a user-specified range.

Adjustment List

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

Setting the unit to automatically track the bottom:
1. Highlight Range on the Adjustment Bar. 2. Using the UP or DOWN Arrow, select Auto at the top of the 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 allow the unit to automatically select a viewing area based on the bottom.

To change the view:

1. Highlight View on the Adjustment Bar. 2. Press the UP or DOWN arrows to change the setting.

Zoom Adjustment

To have the unit automatically set a view:
1. Highlight View on the Adjustment Bar 2. Using the UP or DOWN Arrow, move the slider to the top or bottom of the range then release and press the Arrow again.

View Adjustment

The Gain Adjustment allows the user to control the sensitivity of the units receiver. This provides some flexibility in what is seen on the display. To see more detail, increase the receiver sensitivity by selecting a higher gain (+). If there is too much detail or if the screen is cluttered, lowering the sensitivity (-) may increase the clarity of the display.

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.

Minimum Gain

Normal Gain

Maximum Gain

08/16/00, 2:47 PM
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.
Unit Operation Setup Menu/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 eld and press ENTER. 3. Using the UP or DOWN arrow select the desired symbol and press ENTER.

Fish Symbols

All available information will be displayed.
Suspended targets will display as symbols. In this mode
background information will still be displayed making sh identication easier.
Same as above with target depth displayed.
Suspended targets displayed as symbols. No background
information will be displayed in this mode.

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 eld and press ENTER. 3. Choose ON or OFF and press ENTER to accept the selection.

Scroll Speed

Whiteline Selections
The speed that the chart scrolls from right to left can be adjusted 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, press ENTER to accept the selection.

Scroll Speed Selections

If you are using the Fishnder 240 on the portable case battery power, slowing the scroll rate will help to conserve your battery.
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.
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, press ENTER to accept the selection.

Scale Overlay

Scale Corners

Scale Basic

Scale No Scale
Unit Operation Setup Menu/Tools
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 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, MEDium or HIGH setting.

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 sh or structure.
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, 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 eld and press ENTER. 3. Select ON or OFF and press ENTER to accept the selection.
Graphic Flasher Selections

Simulator

The Simulator tool allows you to select a transducer type for use with the Fishfinder 240s 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.

Simulator Selections

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 eld and press ENTER. 3. Choose Normal or Large, press ENTER to accept the selection.
Normal Numbers Large Numbers
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 eld and press ENTER. 3. Choose Show or Hide, press ENTER to accept the selection.

The Battery Voltage alarm can be set to warn you when the battery is reaching a critical state of discharge.
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.

Deep Water Alarm

Setting the Battery Volts Alarm:
1. Highlight the Battery Volts eld and press ENTER. 2. Using the arrow keys input the desired voltage, press ENTER to accept the setting.

Battery Voltage Alarm

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.

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

Beeper

Contrast Adjustment
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, or Key & Alarms, press ENTER to accept the setting.

NMEA Output

The Fishnder 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 eld and press ENTER.

Beeper Selections

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

Calibration

Keel Offset
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 Calibration tab on the Setup Menu. 2. Highlight the Keel Offset eld and press ENTER. 3. Using the arrow keys enter a new offset, press ENTER to accept.
Unit Operation Setup Menu/Calibrations

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 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 eld will become available. This will allow you to calibrate the Fishnder 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 eld highlighted, press ENTER and input your top speed. Highlight OK and press ENTER to nish the calibration.

Soft Bottom

Whiteline Turned Off

Whiteline Active
Structure is hard, probably a rock or stump
Structure is soft, probably a mud pile

Example 3.

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 denition 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

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. 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 Specic 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 eld. 3. Press ENTER. Choose the desired transducer from the list. 4. Press ENTER to accept the transducer selection.
On the Water Simulator Mode
Simulator Message and Icon
To exit the Simulator, turn the unit off.
Simulator Transducer Selections

Physical

Case: Fully Gasketed, high-impact plastic alloy
On the Water Appendix A Specications
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 158F (-15C to 70C) Waterproof: IEC 529, level IPX-7 (submerged to 1 meter for 30 minutes)
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*

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. Specications subject to change without notice.

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

Unit Needs Repair

Memory Deleted

Supply Voltage Low

Increase Setting

Supply Voltage High

08/16/00, 2:48 PM

Fishfinder 240 Portable
On the Water Appendix C Fishnder 240 Portable

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 Fishnder 240. The case is water resistant but is not designed to oat in the event it should go overboard.
Use the two square eyelets located by the handle to secure the Fishnder 240 Portable Case to the boat.
The Suction Cup Transducer
Using the Portable unit you will still need to nd a suitable location for the transducer. If you are in a slow moving boat such as a canoe or at bottom boat, the mounting location is not as critical. Follow these simple guidelines and you should be ne.
1. Look for clean (non-turbulent) water
Secure Fishnder 240 to the boat using the provided eyelets
2. Mount the transducer with approximately 1/2 extending beyond the bottom of the boat. 3. Do not mount the transducer behind strakes on the bottom of the boat or in the path of a prop. 4. If you experience poor reception, try another location.
WARNING! Speeds in excess or 20 MPH may cause the transducer to y off and strike occupants of the boat.
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.

Batteries

The Fishnder 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.
D-Cell and Optional Gel-Cell Battery Packs
Installing a Gel Cell Battery: Verify that the Gel-Cell battery has male spade connectors installed on the positive and negative leads.
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
Install the battery pack into the moulded location in the Portable case
On the Water Appendix D Index
Accessories.... iii Adjust the Scroll Speed.... 16 Adjustment Bar... 12 Alarms.... 22, 35 Arrow Keys.... 10
Batteries.... 37 Battery Voltage (alarm).... 23 Battery Voltage (display)... 20 Beeper.... 24
Calibration.... 25 Chart.... 15 Contrast.... 24
Deep Water.... 23 Depth... 26 Depth Line.... 18 Display...vi Display Installation... 7

Enter Key.... 10

Factory Setup... 27 Fish Alarm.... 22 Fish Symbols.... 15 Fishnder 240 Portable... 36 Flasher.... 19 Flush Mount.... 8

Gain... 14

In-hull Installation... 3 Installing the Display.... 7
Keel Offset.... 25 Keypad.... 10

Limited Warranty.... ii

Memory.... 27 Messages... 35
NMEA Output.... 24 Noise Reject... 18 Number Size.... 20 Numbers... 20

Operation.... 28

Portable Case.... 36 Power Key.... 10
Range... 12 Remember.... 27
Scale.... 17 Scroll Speed... 16 Setup Key.... 10 Setup Menu.... 15 Shallow Water.... 22 Simulator.... 19
Software Version.... 27 Specications... 34 Speed... 1, 26 Speed Sensor.... 25 Suction Cup Transducer... 36 System.... 24
Table of Contents.... iv Temperature... 21, 26 Testing the Installation... 9 Tools.... 18 Transducers.... 1 Transom Mount Installation... 2 Trolling Motor Installation... 4
Understanding Sonar... 28 Units... 26

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

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

The location has to be solid berglass, devoid of any air bubbles, laminates, 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.
Many modern hulls have a pre located 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 the unit for optimum performance. Place the transducer in the test device as show on the side bar. If the sonar performance is signicantly degraded, another location will need to be tested.
Weight transducer to hold it in place PVC Pipe or a Can Fill Pipe or Can with water or a light mineral oil Strip Caulk or RTV Sealer

Hull Surface

Continued on page 4
In-Hull Installation (continued) Installing the Transducer:
Installation Mounting the Transducer/ Speed Sensor
Apply twisting motion to eliminate any trapped air bubbles Weight transducer in place for at least 24 hours Slow cure 2-part epoxy
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 2-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.
Speed Sensor Installation
Strip Caulk or RTV Sealer
The speed sensor should be mounted as near the center of the boat as possible. Like the transducer, for the speed sensor to operate properly, it should be located in non-turbulent water. Follow the directions in the speed sensor installation instructions to assemble the speed sensor with the mounting bracket, drill holes in the transom, mount the assembly and route the cable.
Installing the Transducer
Drill a 3/4 hole well above the water line. Coat the inside of the hole with Marine Sealant.
Position Cable Clamps about one-third of the distance from the hole to the transducer.
Adjust the speed sensor so it is parallel with the bottom of the boat. If the speed sensor is not adjusted properly, the sonar may experience inaccurate or degraded speed readings.
Drill 1/8 pilot holes 3/8 deep for the mounting screws. Coat the screws with Marine Sealant before installing them.

Wiring Harness Installation
The Fishfinder 240 Blue 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. 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

Installation Installing the Wiring Harness

10-18 Volt Boat Supply

Install 2-Amp Fuse
If your boat has an electrical system, it may be possible to wire the unit directly to an unused holder on your current fuse block. If you are using the boats fuse block, remove the in-line fuse holder supplied with the unit.
Installing the Wiring Harness:
1. Determine the polarity of the fuse holder using a Test Light or Volt Meter. 2. Install the Red (+) wire on the Positive Fuse Holder Terminal. 3. Install the Black (-) wire on the Negative Fuse Holder Terminal. 4. Install a 2 amp fuse in the Fuse Holder.

Boat Ground

Black Wire
During a typical installation, only the Red and Black wires are used. The Blue wire supplies NMEA data, and doesnt have to be connected for normal operation of the unit. The Yellow (alarm) wire is not used, because the Fishnder 240 Blue does not support external alarms.

Continued on page 6

Red Wire
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. The Fishnder 240 Blue can be connected to another piece of NMEAcompatible electronic equipment. If equipped with a capable transducer and speed sensor, the Fishnder 240 Blue sends depth, temperature and speed information that could be displayed on another device.
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.

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.

Zoom Adjustment

To have the unit automatically set a View:
1. Highlight View on the Adjustment Bar. 2. Using the UP or DOWN Arrow, move the slider to the top or bottom of the range, then release and press the Arrow again.

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.
To change the Depth Number Setting:
1. Highlight the Numbrs tab on the Setup Menu. 2. Highlight the Depth Number selection eld and press ENTER. 3. Choose Auto or From Chart, then press ENTER to accept the selection.
Unit Operation Setup Menu: Alarms Tab
Alarms Tab The Alarms tab allows you to activate and configure the four alarms available in the Fishfinder 240 Blue. To access the Alarms tab, place the highlight over it using the arrow keys. See page 37 for alarm icons and messages.

Fish Alarm

The Fish Alarm can be congured to sound by sh size. There are four different alarm selections: Off, Small, Medium and Large, Medium and Large, or Large. The Fish Alarm will sound with or without the Fish Symbols activated on the Chart Tab of the Setup Menu.

To set a Fish Alarm:

1. Highlight the Alarms tab on the Setup Menu. 2. Highlight the Fish Alarm selection eld and press ENTER. 3. Choose the desired setting, then press ENTER to accept the selection.

Fish Alarm Selections

Shallow Water
The Shallow Water Alarm can be set to sound a warning at a depth determined by the user. The alarm must be activated before the unit will sound a warning.
To activate/deactivate the Shallow Water Alarm:
1. Highlight the Alarms tab on the Setup Menu. 2. Highlight the Shallow Water checkbox. 3. Pressing ENTER will insert or remove a check mark in the checkbox.
To set the Shallow Water Alarm depth:
1. Highlight the Shallow Water depth eld and press ENTER. 2. Use the Arrow Keys to input the desired depth, then press ENTER to accept the setting.

Deep Water

Shallow Water Alarm
The Deep Water Alarm can be set to sound a warning at a depth determined by the user. The alarm must be activated before the unit will sound a warning.
To activate/deactivate 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.
To set the Deep Water Alarm depth:
1. Highlight the Deep Water depth eld and press ENTER.

Deep Water Alarm

2. Use the Arrow Keys to input the desired depth, then press ENTER to accept the setting.
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

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 Calibrt tab on the Setup Menu. 2. Highlight the Water Type selection eld and press ENTER. 3. Choose Fresh or Salt, then press ENTER to accept the selection.

Unit Operation Setup Menu: Memory Tab
The Fishnder 240 Blue can be set to remember its settings each time you power it on. You can set it to remember the settings in the Setup Menu (Setup Only) or the units settings in both the Setup Menu and the Adjustment Bar (All).
To select a Memory Setting:
1. Highlight the Memory tab on the Setup Menu. 2. Highlight the Remember eld and press ENTER. 3. Choose All or Setup Only, then press ENTER to accept the selection.
Factory Setup To restore the Factory Settings:
1. Highlight the Memory tab on the Setup Menu. 2. Highlight the Factory Setup button and press ENTER. 3. Choose OK to reset the unit or Cancel to abort.
Remember Selections Restore Factory Settings

Software Version

The Software Version Button will report information about the current software version in the unit and display the Unit 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.
Software Version Information
On the Water Unit Operation and the Chart
Understanding Sonar If you are unfamiliar with sonar, or need help determining what is displayed on the chart, then this section may be for you. This section is intended to help the novice user gain some understanding of how the Fishfinder 240 Blue 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 coneshaped pattern. When a transmitted sound wave 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 returnedfirst 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. This first strong return sets the bottom level. Weaker secondary returns provide the detailed data. Stronger returns will display in darker colors, with black being the strongest return. In Examples 1 and 2 (page 32), you can see that the branches and the fish were the strongest secondary returns and are indicated in black on the display. That is a brief description of how your Fishfinder operates. Lets take a look at how this data can help you to improve your fishing.

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.