2001 Chevrolet Impala Owner's Manual - Page 169

Compass Variance Compass variance is the difference between magnetic north and geographic north. In some areas of the country, the difference is great enough to cause the compass to give false readings. If this occurs, the compass variance must be set. Setting the Variance Turn the ignition on and cycle the DIC to the Compass/Temperature mode. Press the RESET button for approximately five seconds. The last entered variance zone number and "VAR" will be displayed. Press the MODE button until the proper variance number on the map is shown. Press the RESET button to set the new variance zone and resume normal operation. All the display segments will be illuminated briefly to acknowledge the change in zone number. A chime will sound to confirm that the new zone number has been set. Automatic Compass Calibration The compass is self-calibrating, which eliminates the need to manually set the compass. When the vehicle is new, the calibration process may not be complete. In these cases "CAL" will be displayed, and all segments of the compass will be illuminated where the compass reading is normally displayed. All Segments Illuminated 2-99