Jeep Grand Cherokee 2016 Owner's Manual page 379

UNDERSTANDING YOUR INSTRUMENT PANEL 377
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 being driven, illustrated in the zone map.
Once properly set, the compass will automatically com-
pensate for the differences when calibrated, and provide
4
the most accurate compass headings.
Compass Variance Zone Map