Humminbird Matrix 20 - Manual (Page 51)

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Depth Offset
(Advanced)
Depth Offset will adjust the digital depth readout to indicate depth from the waterline
or boat's keel. Enter a positive vertical measurement from the transducer to the
waterline to read the depth from the waterline. Enter a negative vertical measurement
from the transducer to keel to read the depth from the keel. This menu choice is
available only when in Advanced User Mode (see Setup Menu Tab: User Mode.)
To change the Depth Offset setting:
1. Make sure you are in Advanced User Mode, then highlight Depth Offset on
the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Depth
Offset setting. (-10.0 to +10.0 feet or -3 to 3 meters [International Models
Only]
, Default = 0)
Temp Offset
(Advanced)
Temp Offset will adjust the temperature readout by the amount entered. This menu
choice is available only when in Advanced User Mode (see Setup Menu Tab: User Mode.)
To change the Temp Offset setting:
1. Make sure you are in Advanced User Mode, then highlight Temp Offset on
the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Temp
Offset setting. (-10.0 to +10.0 degrees, Default = 0)