Ford 2002 Crown Victoria Manual page 77

Driver Controls
Electronic compass (if equipped)
The compass reading will remain accurate during most driving
conditions. Unknown to the driver, the compass is continuously
recalibrating due to magnetic fields and subtle, slow changes in vehicle
magnetics which can occur over the life of the vehicle.
The compass reading will remain fixed when significant levels are
experienced (such as steel bridges). The compass will return to normal
operation upon leaving the magnetized area.
If highly magnetized items (such as magnetic mount antennas) are
placed very near the compass the display will change to "C" for 15
seconds, then display all segments until the magnetized item is removed.
If a "C" is displayed, 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 compass zone
you are in by referring to the zone
map.
2. Turn the ignition to the ON/RUN
position.
3. With the compass display turned
on, press and hold the COMP side of
NW
the control for no more than six
seconds until the zone selection
COMP MIRROR
number appears in the mirror
display window. If a "C" appears
repeat this step.
4. Release the COMP side of the
control, then press it down again.
5. Continue to press until your zone number is shown in the mirror
display, then release.
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