Depth Offset (Advanced); Temp. Offset (Advanced) - Humminbird 398ci SI Combo Operation Manual

Default Sonar View
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.
Temp. Offset will adjust the temperature readout by the amount entered.
Setup Menu Tab
Depth Offset
(Advanced)
Settings: -10.0 to +10.0 feet, or -3.0 to 3.0 meters
(International Models only); Default = 0 ft
Temp. Offset
(Advanced)
Settings: -10.0 to +10.0 degrees, Default = 0
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Sonar View with Select Readouts