Compass
Variance
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
you live outside
zone eight. Under certain circumstances, as during
a long distance cross-country trip, it will be necessary to
adjust for compass variance. Compass variance is
the difference between earth’s magnetic north and true
geographic north.
If
not adjusted to account for
compass variance, your compass could give false
readings.
To
adjust for compass variance, do the following:
1.
Find your current location and variance zone
number on the following zone map.
2.
Press and hold COMPASS
(or
the on/off button for
mirrors equipped with Onstar@ controls) until a
zone number appears in the display.
3. Once a zone number appears in the display, press
the COMPASS button (or the on/off button for
mirrors equipped with Onstar@ controls) quickly until
the correct zone number appears in the display.
Stop pressing the button and the mirror will return to
normal operation. If C appears in the compass
window, the compass may need calibration. See
“Compass Calibration” explained previously.
2-36
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