Toyota HILUX Owner's Manual page 339

338
5-16. 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 depending
on the geographic position of the vehicle.
If you cross over one of the map boundaries shown in illustration, the com-
pass will deviate.
To obtain higher precision or perfect calibration, refer to "Deviation calibra-
tion".