Chevrolet 2003 Astro Owner's Manual page 121

Driver Information System
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Your vehicle may have this feature. This system displays
the outside air temperature, compass direction and trip
information in the overhead console.
US/MET (United StatedMetric): The US/MET button
allows you to switch the display between the English and
metric system.
MODE: The MODE button can be used to toggle
between three modes of operation: OFF, COMP/TEMP
and TRIP.
COMPTTEMP (CompassTTemperature): This display
provides the outside temperature and one of eight
compass readings to indicate the direction the vehicle
is facing.
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, the display will
toggle between the word ICE and the current
temperature every eight seconds. 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, if C (Calibration) is displayed, the
compass will need to be calibrated. You may also place
the compass in a noncalibrated mode by pressing and
holding the US/MET and MODE buttons simultaneously
while in the COMPREMP mode. After about 10 seconds.
the compass will display C and you can release the
buttons. Drive the vehicle in a complete 360" circle three
times at a speed of less than 5 mph (8 km/h), and the
compass will function normally. Once the calibration is
complete, the display will return to a compass reading.
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.
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