FORD 2000 Expedition - Manual (Page 72)

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.
With trip computer
2. Locate the compass module
mounted on the center rear view
mirror post.
3. Turn ignition to the ON position.
4. Press and hold the RESET button
on top of the compass module until
the message display in the trip
computer shows the current zone
setting.
5. Release the RESET button.
6. Press the RESET button until the correct zone is displayed on the trip
computer.
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Controls and features
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