Humminbird 787c2i - Manual (Page 135)

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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)
Speed Calibration
(Advanced, with Temp/Speed only)
Speed Calibration will adjust the speed readout by the percentage entered,
and will appear in the menu if a Temp/Speed Accessory is connected and the
paddlewheel has moved at least once, when the unit is in Advanced User Mode
(see Setup Menu Tab: User Mode.)
To change the Speed Calibration setting:
1. Make sure you are in Advanced User Mode, then highlight Speed
Calibration on the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Speed
Calibration setting. (-20% to +20%, Default = 0%)