Compass Magnetic Variation Adjustment

Magnetic variation adjustments are required when the compass displays a constant error in heading. Variation is the difference between magnetic north and true north due to geographical location.

Fig 1: Illustrating Magnetic Variation Zones
Courtesy of GENERAL MOTORS CORP.
1. Locate your geographic location. Refer to the variation zone map.
2. Turn ON the ignition, with the engine OFF.
3. Press the MODE button in order to advance to the COMPASS CALIBRATION mode.
4. Press the SELECT button in order to display RESET CHANGES ZONE.
5. Press the RESET button in order to advance to the proper zone number.
6. Press the MODE button in order to enter and set the zone number.