Ford 2002 Taurus User Manual page 71

Driver Controls
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. With the compass display turned
on, press and hold the COMP side of
NW
the control for no more than five
seconds until the zone selection
COMP MIRROR
number appears in the mirror
display window. If a "C" appears, see
Compass calibration adjustment.
3. Release the COMP side of the
control, then press it down again.
4. Press and release until your zone number is shown in the mirror
display.
5. The display will show all segments, then return to normal compass
mode within ten seconds.
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