Toyota 2011 Matrix Owner's Manual page 333

3-7. Other interior features
Calibrating the compass
The direction display deviates from the true direction determined by
the earth's magnetic field. The amount of deviation varies according
to the geographic position of the vehicle.
If you cross over a map boundary shown in the illustration, the compass
will deviate.
To obtain higher precision or perfect calibration, refer to the following.
■
Deviation calibration
Stop the vehicle.
STEP 1
STEP 2
Press "AUTO" and, referring to the map above, select the
STEP 3
number of the zone where you are.
If the direction is displayed several seconds after adjustment, the
calibration is complete.
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Press and hold "AUTO" for 6
seconds.
A number (1 to 15) appears on
the compass display.