Compass Calibration; Compass Variance - Chevrolet Malibu Hybrid 2008 Owner's Manual

Compass Calibration

If after a few seconds the display does not show a
compass direction, (N for North for example), there may
be a strong magnetic field interfering with the compass.
Such interference may be caused by a magnetic antenna
mount, note pad holder, or similar object. If the letter C
appears in the compass window, the compass may need
to be reset or calibrated.
The mirror can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display reads a
direction.

Compass Variance

Compass variance is the difference between earth's
magnetic north and true geographic north. If the mirror is
not adjusted for compass variance, the compass could
give false readings.
The mirror is set in zone eight upon leaving the factory. It
will be necessary to adjust the compass to compensate
for compass variance if the vehicle is driven outside zone
eight. Under certain circumstances, such as a long
distance, cross-country trip, it will be necessary to adjust
the compass variance.
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To adjust for compass variance, do the following:
1. Find your current location and variance zone number
on the zone map that follows.
2. Press and hold the on/off button until a zone number
appears on the display.
3. Once the zone number appears on the display, press
the on/off button quickly until you reach the correct
zone number. If C appears in the compass window,
the compass may need calibration. See "Compass
Calibration" listed previously.