Compass Calibration Procedure

Variance Settings:

VARIANCE SETTING PROCEDURE
Variance is the difference between magnetic North and geographic North. To adjust the compass variance set the CMTC to Compass/Temperature mode and press both US/M and STEP buttons for up to one second than the symbol VAR and the current variance zone number will be displayed. Press the STEP button to select the proper variance zone as shown. After five seconds of inactivity, the displayed zone will be automatically set and normal operation in the Compass/Temperature mode resumed.

DIRECT METHOD
Turn the vehicle to head in either a North or South direction. The vehicle must be within 45 degrees of the North or South position or the SETTING the VARIANCE will be ignored. The vehicle may be stationary or driving at any speed for this operation. Depress the STEP button until the Compass/Temperature screen is displayed. Simultaneously press both the US/M and STEP buttons up to one second, than the symbol VAR and the current variance zone number will be displayed. Within the next five seconds momentarily press the US/M button. The variance will be set and normal operation in the Compass/Temperature mode resumed. If the US/M button is not pressed within the five seconds interval, the compass variance shall not be changed and normal operation in the Compass/Temperature mode resumed. If the VAR symbol flashes twice before resuming operation, the new zone was not accepted. Realign the vehicle to within ± 45 degrees of North or South and try again.