FORD 2003 F-550 v.2 - Manual (Page 63)

The compass heading is displayed in average fuel economy modes, fuel
range modes and temperature modes.
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 or on the vehicle may also affect
compass accuracy. Adjustments may need to be made to the zone and
calibration of the compass.
Compass zone adjustment
1. Determine which magnetic zone
you are in for your geographic
location by referring to the zone
map.
2. Locate the trip computer on the
overhead console.
3. Turn ignition to the ON position.
4. Press and hold both trip computer
controls. After approximately four
seconds, the trip computer will enter
zone setting mode. Zone setting
mode is indicated when the display
lights the “ZONE” indicator.
5. Release both controls. Subsequent
pressing of either control will
increment the zone. Press the control repeatedly until the correct zone
setting for your geographic location is displayed on the trip computer.
6. To exit the zone setting mode and save the displayed zone in memory,
release both controls for greater than five seconds.
Compass calibration adjustment
Perform this adjustment in an open area free from steel structures and
high voltage lines.
For optimum calibration, turn off all electrical accessories (heater/air
conditioning, wipers, etc.) and make sure all vehicle doors are shut.
1. Locate the trip computer located in the overhead console.
2. Start the vehicle.
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Driver Controls
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