Jeep Grand Cherokee Owner's Manual page 124

Manual Compass Calibration
If the compass appears erratic and the "CAL"
indicator does not appear in the EVIC display,
you must put the compass into the Calibration
Mode manually, as follows:
1. Turn on the ignition switch.
2. Press the MENU button until Personal Set-
tings (Customer-Programmable
menu is reached.
3. Press the SCROLL button until "Calibrate
Compass" is displayed in the EVIC.
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4. Press and release the FUNCTION SELECT
button to start the calibration. The "CAL" indi-
cator will be displayed in the EVIC.
5. Complete one or more 360° turns (in an area
free from large metal or metallic objects) until
the "CAL" indicator turns off. The compass will
now function normally.
Features) Compass Variance
Compass Variance is the difference between
Magnetic North and Geographic North. To
compensate for the differences, the variance
should be set for the zone where the vehicle is
driven, per the zone map. Once properly set,
the compass will automatically compensate for
the differences and provide the most accurate
compass heading.
NOTE:
Magnetic materials should be kept away
from the overhead console. This is where
the compass sensor is located.