Hummer 2006 H2 - Manual (Page 119)

To adjust for compass variance, do the following:
1. Find your current location and determine the correct
zone number from the zone map.
2. Press and hold the on/off button for approximately
six seconds until ZONE appears in the display.
Then release the button. The number displayed is
the current zone value.
3. If a new zone value is desired, briefly press the
on/off button until you reach your desired zone
number.
4. After four seconds, the zone entry mode will end.
The display will return to normal operation and the
new zone number will be set.
Cleaning the Mirror
Use a paper towel or similar material dampened with
glass cleaner. Do not spray glass cleaner directly on the
mirror as that may cause the liquid cleaner to enter
the mirror.
Automatic Dimming Rearview Mirror
with Compass
Your vehicle may have an automatic-dimming rearview
mirror with a compass.
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