FORD 2009 F-550 v.1 - Manual (Page 141)

The compass reading may be affected when you drive near large
buildings, bridges, power lines and powerful broadcast antenna. 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 zone/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/calibration adjustment.
Compass zone/calibration adjustment
1. Determine your magnetic zone by
referring to the zone map.
2. Turn ignition to the on position.
3. Start the engine.
4. From the SETUP menu, press
and release the RESET control until
the message center display changes
to show the current zone setting
(XX).
5. Press and release the RESET control repeatedly until the correct zone
setting for your geographic location is displayed on the message center.
The range of zone values are from 1 to 15 and “wraps” back to 1.
6. To exit the zone setting mode, and to “lock in” your change:
• press and release the SETUP control or,
• press INFO control to exit or,
• wait four seconds and the zone will be “locked in”.
1 2 3
4
5
6 7 8 9 1011
12
13
14
15
2009 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)
Driver Controls
141