FORD 2004 F-150 v.5 - Manual (Page 79)

Contact your dealer as soon as possible if these messages occur on a
regular basis.
MINI MESSAGE CENTER ELECTRONIC COMPASS/TEMPERATURE
DISPLAY (IF EQUIPPED)
Outside air temperature
The outside temperature display is
contained in the instrument cluster
and displays all the time, except
when a warning message is present.
To turn the display off or change
the display from English to metric see your dealer.
Compass
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.
Compass zone adjustment
2004 F150 (f12)
Owners Guide (post-2002-fmt)
USA English (fus)
Driver Controls
79