FORD 2002 Windstar v.2 - Manual (Page 107)

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/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/calibration adjustment.
Compass zone/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.
1. Turn ignition to the ON position.
2. Start the engine.
3. Determine your magnetic zone by
referring to the zone map.
4. From Info menu, select the
Compass/Outside Temperature
function.
5. Press and hold the RESET
control until the message center
display changes to show the current
zone setting.
6. Release the reset control, then
slowly press down again.
7. Press the SETUP control
repeatedly until the correct zone
setting for your geographic location
is displayed on the message center. To exit the zone setting mode press
and release the RESET control.
Driver Controls
107