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To adjust for compass variance, do the following:
1. Find your current location and variance zone number
on the map.
2. Press and hold the COMP button for three seconds.
If your vehicle has the optional mirror with the
compass, temperature display and OnStar system,
press the on/off button for six seconds. Release the
button when “ZONE” is displayed. The number
shown is the current zone number.
3. Scroll through the zone numbers that appear in the
compass/temperature window on the mirror by
pressing the COMP button or the on/off button.
Once you find your zone number, release the button.
After about four seconds, the mirror will return to
the compass and temperature display, and the new
zone number will be set.