Humminbird 500 SERIES 596C - Manual (Page 64)

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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 option is available when the User Mode is set to
Advanced (see Main Menu: User Mode).
To change the Depth Offset setting:
1. Make sure the User Mode is set to Advanced, then highlight Depth
Offset on the Setup main menu.
2. Press the LEFT or RIGHT Cursor 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, with Temp/Speed only)
Temp. Offset will adjust the temperature readout by the amount entered, and
will appear in the menu if a Temp/Speed Accessory is connected and the
paddlewheel has moved at least once. This menu option is available when the
User Mode is set to Advanced (see Main Menu: User Mode).
To change the Temp. Offset setting:
1. Make sure the User Mode is set to Advanced, then highlight Temp.
Offset on the Setup main menu.
2. Press the LEFT or RIGHT Cursor keys to change the Temp. Offset
setting. (-10.0 to +10.0 degrees, Default = 0)
Setup Menu Tab