Lexus 2004 GX470 Owner's Manual page 226

Calibrating the compass (deviation calibration)
The direction display on the compass deviates from the true
direction determined by the earth's magnetic field. The angle
of deviation varies according to the geographic position of the
vehicle.
To adjust this deviation, stop the vehicle, then push and hold
the "COMP" switch until the zone number appears on the
display. Then push the "COMP" switch, referring to the
following map to select the number of the zone where the
vehicle is.
STEERING WHEEL AND MIRRORS
16PY145
" Zone numbers
Leaving the system after the calibration for several seconds,
the direction will appear on the display. It shows the zone
number is set.
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