GF54.50-P-2014RT Adjust Compass Zone, Function

GF54.50-P-2014RT Adjust Compass Zone, Function

Adjust compass zone (declination):
^ Determine corresponding compass zone (1 to 15) by means of the zone maps illustrated below (declination maps).
^ Ignition: "ON"
^ Press the system selection button (S110s3) until the settings menu appears in the multifunction display (A1p13)
^ Press button + and -, setting of specific functions and volume control (S111s1) until the vehicle submenu appears in the multifunction display.
^ Press the scroll forward/back button (S110s1) until the message compass setting appears in the multifunction display.
^ Press the mode button twice in order to return to the compass display and to store the compass zone displayed.
^ Enter compass zone with the button + and -, setting of specific functions and volume control.

Examples:
^ San Francisco location:
Compass zone 4 can be seen from the North America zone map.
^ Berlin location:
Compass zone 8 can be seen from the Europe, Africa zone map.
^ Bonn location:
Compass zone 9 can be seen from the Europe, Africa zone map.

In order to obtain as accurate a route display as possible, under some circumstances it may be necessary, to change the compass zone during a route. For example, two compass zones are driven through on the trip from Bonn to Berlin (cf examples).

Earth's magnetic field
The compass uses the earth's magnetic field to determine the points of the compass.
The earth's magnetic poles (North/South) however deviate slightly from the geographic poles. The earth's magnetic axis is inclined by approx 20° compared with the earth's rotation axis. Should the points of the compass be determined with the aid of the earth's magnetic field, then correction factors have to be taken into account for various earth zones. 15 different compass zones have been calculated for this. The deviation (declination) is roughly the same at each location within a zone.
If the correct compass zone is entered in the compass, then it can correct the earth's magnetic information accordingly and then specify the route relatively accurately (±10°).