Garmin Fishfinder 100 - Manual (Page 33)

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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.
Transducer at Surface
Enter (+) positive number to
show depth from bottom of
keel
T ransducer at Bottom of Keel
Enter (-) negative number to show
depth from surface
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