Ram Trucks 2010 Chassis Cab - Manual (Page 148)

Compass Variance
Compass Variance is the difference between magnetic
North and Geographic North. In some areas of the
country, 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
using the following procedure:
NOTE: Magnetic materials should be kept away from
the overhead console. This is where the compass sensor is
located.
1. Turn the ignition switch to the ON/RUN position.
2. Press the MENU button until “Personal Settings” is
displayed.
3. Press the STEP button until “Compass Variance” is
displayed.
Compass Variance Map
146 UNDERSTANDING THE FEATURES OF YOUR VEHICLE