Lexus 2008 IS250 Owner's Manual page 269

3-5. 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 illustration, the compass will devi-
ate.
To obtain higher precision or perfect calibration, refer to the following.
Deviation calibration
n
Stop the vehicle where it is safe to drive in a circle.
STEP 1
STEP 2
Press "AUTO", and referring to the map above, select the number
STEP 3
of the zone where you are.
270
Press "AUTO" until a number (1 to
15) appears on the compass dis-
play.