Humminbird 778C - Manual (Page 86)

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Depth Offset
(Advanced)
Settings: -10.0 to +10.0 ft, or -3 to 3 m [International
Models only]; Default = 0
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
(Advanced, with optional Temp/Speed only)
Settings: -10.0 to +10.0 degrees; Default = 0
Temp. Offset will adjust the temperature readout by the amount entered. This
menu option is available if a Temp/Speed Accessory is connected and the
paddlewheel has moved at least once.
Speed Calibration
(Advanced, with optional Temp/Speed only)
Settings: -20% to +20%; Default = 0%
Speed Calibration will adjust the speed readout by the amount entered. This
menu option is available if a Temp/Speed Accessory is connected and the
paddlewheel has moved at least once.
Local Time Zone
(Advanced, with optional GPS only)
Settings: Various, Default = EST [UTC-5] - Eastern
Standard Time
Local Time Zone selects your time zone in reference to the time reported by the
GPS receiver when Time+Date is selected as a Digital Readout on the Sonar
View (see Setup Menu Tab: Select Readouts).
Setup Menu Tab