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Compass Magnetic Variation Adjustment

IMPORTANT: 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.
  1. Locate your geographic location. Refer to the variation zone map.
    Fig 1: Illustrating Magnetic Variation Zones
    GM9020Courtesy of GENERAL MOTORS CORP.
  2. Turn ON the ignition, with the engine OFF.
  3. Press the MODE button in order to advance to the COMP/TEMP mode.
  4. With the DIC in the COMP/TEMP mode, simultaneously depress and hold the MODE and US/MET buttons until VAR CAL is displayed, in approximately 5 seconds.
  5. Release both buttons.
  6. Press the US/MET button in order to advance to the proper zone number.
  7. Press the MODE button in order to enter and set the zone number.
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