Dodge 2004 Durango Owner's Manual page 125

UNDERSTANDING THE FEATURES OF YOUR VEHICLE 125
free from large metal objects or power lines. The CAL
symbol will turn off and the compass will function
normally.
Compass Variance is the difference between magnetic
north and geographic north. In some areas of the country,
3
the difference between magnetic and geographic north is
great enough to cause the compass to give false readings.
If this occurs, the compass variance must be set according
to the Compass Variance Map.