CHEVROLET 2009 Suburban - Manual (Page 250)

To adjust for compass variance, use the following
procedure:
Compass Variance (Zone) Procedure
1. Do not set the compass zone when the vehicle is
moving. Only set it when the vehicle is in P (Park).
Press the vehicle information button until PRESS
V
TO CHANGE COMPASS ZONE displays.
Or, if the vehicle does not have DIC buttons, press
the trip odometer reset stem until CHANGE
COMPASS ZONE displays.
2. Find the vehicle’s current location and variance
zone number on the map.
Zones 1 through 15 are available.
3. Press the set/reset button to scroll through and
select the appropriate variance zone.
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