Humminbird 597ci - Manual (Page 116)

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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)
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, and when the User Mode is set to
Advanced (see Main Menu: User Mode).
To change the Speed Calibration setting:
1. Make sure the User Mode is set to Advanced, then highlight Speed
Calibration on the Setup main menu.
2. Press the LEFT or RIGHT Cursor keys to change the Speed Calibration
setting. (-20% to +20%, Default = 0%)
Setup Menu Tab