Ford Mercury Manual page 374

Driver Controls
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
in this section.
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 in this section.
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. Locate compass sensor mounted
at base of mirror.
4. Press the button on the top of
the compass module until ZONE
appears in the instrument cluster
display.
5. Release pressure on the button and then slowly press it down again.
6. Continue to press until ZONE
appears in the instrument cluster
display, then release. The display
should show the current zone
number.
7. Press until the desired zone
number appears. The display will flash and then return to normal
operation. The zone is now updated.
62
3 2 1
4
5
6 7 8 9 1011
15
14
13
12