Ford 2002 Expedition Owner's Manual page 75

Driver controls
Trip computer
For information on the trip computer, refer to Trip computer this
chapter.
Electronic compass (if equipped)
The compass reading may be affected when you drive near large
buildings, bridges, power lines and powerful broadcast antennas.
Magnetic or metallic objects placed in, on or near the vehicle may also
affect compass accuracy.
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.
Electronic compass/temperature display (without trip computer)
Outside air temperature
The temperature display can be
turned off and on by pressing the
SELECT control on the overhead
console. The temperature can be
displayed in Centigrade or
Fahrenheit by pressing the SELECT
control.
If the outside temperature falls
below 3°C (38°F), the display will
alternate from "ICE" to the outside
temperature at a two second rate
for one minute.
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AUTO
ROOF
CAL