Buick 2005 Terraza - Manual (Page 180)

Compass Calibration (Uplevel Only)
The compass is self-calibrating, which eliminates the
need to manually set the compass.
However, under certain circumstances, such as during
a long distance cross-country trip, it will be necessary
to compensate for compass variance and reset the
zone through the DIC.
Compass variance is the difference between the
earth’s magnetic north and true geographic north.
If not adjusted to account for compass variance, the
compass in the vehicle could give false readings.
In order to do this, the compass must be set or
calibrated to the variance zone in which the vehicle is
travelling.
To adjust for compass variance, use the following
procedure:
1. Press the menu button until COMPASS ZONE
displays.
2. Find the vehicle’s current location and variance
zone number on the map.
3. Press the set/reset button to scroll through and
select the appropriate variance zone.
4. Press the menu button to advance to the
COMPASS CALIBRATION screen.
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