GMC 2001 Envoy - Manual (Page 133)

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Turn the display on or off by pressing the ON/OFF
button. Display the temperature in either degrees
Fahrenheit (English) or Celsius (metric) by pressing
the US/MET button.
Before you turn on the ignition and move the vehicle,
the temperature indicated will be the last outside
temperature recorded with the ignition on.
If the outside temperature is 37
_F (3_C) or lower
when you turn on the ignition, “ICE” will appear
on the display. This is a warning to the driver that road
conditions may be icy, and that appropriate precautions
should be taken.
The compass is self - calibrating, so it does not need to
be manually set. However, when your vehicle is new,
the compass may function erratically. If it does, “CAL”
(Calibration) will appear on the display. To correct the
problem, drive in a complete 360 degree circle three
times, and the compass will function normally.
Variance is the difference between magnetic north and
geographic north. In some areas, the difference between
the two can be great enough to cause false compass
readings. If this happens, follow these instructions to
set the variance for your particular location:
1. Find your location on the zone map. Record your
zone number.
2. Press and hold both the ON/OFF and the US/MET
buttons. The display will go off.