FORD 2003 Expedition v.2 - Manual (Page 126)

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 calibration
adjustment.
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. Start the engine.
4. Press the TRIP/RESET button
(near your odometer display), hold
for six seconds and release. You will
see that ZONE appears in the
instrument cluster display.
5. Press and release the button until
the desired zone number appears.
Note: The range of zone values are from 01 to 15 and “wraps” back to
01.
6. When you get to the desired ZONE number, hold the TRIP/RESET
button down to “lock in” the new value.
The cluster display will return to the “normal” mode when the
TRIP/RESET button has not been pressed for 6 seconds.
Compass calibration adjustment
Perform this adjustment in an open area free from steel structures and
high voltage lines. For optimum calibration, turn off all electrical
accessories (heater/air conditioning, wipers, etc.) and make sure all
vehicle doors are shut.
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Driver Controls
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