Ram Trucks 2007 3500 (Diesel) - Manual (Page 148)

Recalibrating The Compass
Turn on the ignition and set the display to “Compass/
Temperature.” Press and hold the RESET button to
change the display between VAR (compass variance) and
CAL (compass calibration) modes. When the CAL sym-
bol is displayed complete one 360° turn in an area 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,
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.
148 UNDERSTANDING THE FEATURES OF YOUR VEHICLE