Toyota 2009 Tundra Owner's Manual page 480

3-7. Other interior features
Calibrating the compass
Samoa: 5 Guam: 8
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
deviate.
To obtain higher precision or accurate calibration, refer to the following.
Deviation calibration
n
Stop the vehicle where it is safe to drive in a circle.
Press the switch, and referring to the map above, select the
number of the zone where you are.
If the direction is displayed several seconds after adjustment, the
calibration is complete.
456
Saipan: 8
Press the switch until a number
(1 to 15) appears on the com-
pass display.