2010 Toyota Tundra Regular Cab Owners Manual - Page 536

3-8. Other interior features Calibrating the compass 3 Samoa: 5 Guam: 8 Saipan: 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. Interior and exterior features