FORD 2008 Explorer Sport Trac v.1 - Manual (Page 119)

Usually, when something affects the compass readings, the compass will
correct itself after a few days of operating your vehicle in normal
conditions. If the compass still appears to be inaccurate, a manual
calibration may be necessary. Refer to Compass zone adjustment.
Most geographic areas (zones) have a magnetic north compass point that
varies slightly from the northerly direction on maps. This variation is up
to four degrees between adjacent zones and will become noticeable as
the vehicle crosses multiple zones. A correct zone setting will eliminate
this error. Refer to Compass calibration adjustment.
Compass zone adjustment (if equipped)
1. Determine which magnetic zone
you are in for your geographic
location by referring to the zone
map.
2. Turn ignition to the ON position.
3. Locate the reset button on top of
the compass sensor mounted behind
the mirror.
4. Press and hold the reset button
on the compass module for
approximately 4 seconds until
COMPASS ZONE XX appears in the
message center display.
5. Continue to press the reset button until the correct zone appears in
the message center display.
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2008 07+ Explorer Sport Trac (esp)
Owners Guide (post-2002-fmt)
USA (fus)
Driver Controls
119