FORD 2002 Explorer v.1 - Manual (Page 18)

Most geographic areas (zones) have a magnetic north compass point that
varies slightly from the northerly direction on maps. This variation is 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 zone adjustment.
Compass zone adjustment
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 compass sensor mounted
at base of mirror.
4. Insert a paperclip into the small
hole on the bottom of the compass
sensor. Hold down until ZONE
appears in the instrument cluster display.
5. Release pressure on the paperclip and then slowly press it down again.
6. Continue to press until ZONE
appears in the instrument cluster
display, then release. The display
should show the current zone
number.
7. Press until the desired zone
number appears. The display will flash and then return to normal
operation. The zone is now updated.
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Instrumentation
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