Chrysler 2006 PT Cruiser Convertible Owner's Manual page 236

236 UNDERSTANDING YOUR INSTRUMENT PANEL
North is great enough to cause the compass to give false
readings. In order to ensure compass accuracy, the com-
pass variance should be properly set according to the
compass variance map zone that the vehicle is in.
NOTE: Magnetic materials should be kept away from
the Instrument Panel. This is where the compass sensor is
located.