Chrysler PT Cruiser 2008 Owner's Manual page 223

UNDERSTANDING YOUR INSTRUMENT PANEL 221
5. Complete one or more 360 degree turns (in an area free
from large metal or metallic objects) until the "CAL"
message turns off. The compass will now function nor-
mally.
Compass Variance
Compass Variance is the difference between magnetic
North and geographic North. In some areas of the
4
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.