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: View Of World Magnetic Variation Map
Courtesy of GENERAL MOTORS CORP.
1. Locate your current geographic location on the World Magnetic Variation Map.
2. Turn ON the ignition, with the engine OFF.
3. Press and hold the switch for the compass, which may be depicted as compass/temperature or COMP, depending on the type of mirror on the vehicle, until a zone number appears on the compass display.
4. Release and press the switch again until the desired zone number appears.
5. Release and wait 4 seconds. The display will return to a compass heading. The variance procedure is now complete.
6. Calibrate the compass. Refer to Compass Calibration mentioned above.