Garmin Fishfinder 100 User Manual download pdf (Page 33)

Unit Operation

Setup Menu/Calibrations

Calibration

The ‘Cal’ (Calibration) tab contains calibrations fields for ‘Keel Offset’,

and ‘Water Type’ (salt or fresh). These calibrations help to ensure the

Fishfinder 100 will provide the most accurate readings at all times. To

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

Keel Offset

The ‘Keel Offset’ field allows the user to offset the surface reading for

the depth of a keel. Enter a positive number to offset for a keel. It is also

possible to enter a negative number to compensate for a large vessel that

may draw several feet of water. The ‘Keel Offset’ will be reflected in the

depth reading.

To Set a Keel Offset:

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

2. Highlight the ‘Keel Offset’ field and press ENTER.

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

new setting.

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 readings on the

unit.

To Change the Water Type:

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

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

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

Enter (+) positive number to

show depth from bottom of

keel

Enter (-) negative number to show

depth from surface

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Garmin Fishfinder 100 User Manual Page 33