Calibration Keel Offset; Water Type - Garmin Fishfinder 240 Owner's Manual

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Calibration
Keel Offset
The 'Keel Offset' fi eld allows the user to offset the depth reading for a
keel or for the draw on a larger vessel .
To Set a Keel Offset:
1. Highlight the 'Calibration' tab on the Setup Menu.
2. Highlight the 'Keel Offset' fi eld and press ENTER.
3. Using the arrow keys enter a new offset, press ENTER to accept.

Water Type

Since sound waves travel through fresh and salt water at different rates,
it is necessary to select the 'Water Type' to ensure accurate depth readings.
To Change the Water Type:
1. Highlight the 'Calibration' tab on the Setup Menu.
2. Highlight the 'Water Type' selection fi eld and press ENTER.
3. Choose 'Fresh' or 'Salt', press ENTER to accept the selection.
Speed Sensor
With a speed sensor installed, the 'Calibrate Speed' fi eld will become
available. This will allow you to calibrate the Fishfi nder speed to your boats
speedometer or your GPS speed.
To Calibrate the Speed:
1. Highlight the 'Calibration' tab on the Setup Menu.
2. Highlight the 'Calibrate Speed' button and press ENTER.
3. Run your boat, noting your top speed. Stop the boat and press ENTER.
4. With the speed fi eld highlighted, press ENTER and input your top speed.
Highlight 'OK' and press ENTER to fi nish the calibration.
Unit Operation
Setup Menu/Calibrations
Transducer at Surface
Enter (+) positive number to show
Transducer at Bottom of Keel
depth from bottom of keel
Enter (-) negative number to show
depth from surface
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