Humminbird 700 SERIES 798CI - Manual (Page 174)

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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)
NOTE: The availability of the digital readout information corresponds with the view
selected, the accessory attached, and whether or not you are navigating.
Default Sonar View Customized Sonar View
Set Up Menu Tab