GF54.50-P-2014GZ Set Compass Zone Function

GF54.50-P-2014GZ Set Compass Zone Function

Set compass zone (declination):
^ Determine corresponding compass zone (1 to 15) on the basis of the zone maps (declination maps) listed below.
^ Ignition: "ON"
^ Press and keep pressing system selection button (S110s3) until the Settings menu appears in the multifunction display (A1p13).
^ Press and keep pressing Buttons + and - for setting specific functions and volume control (S111s1) until the Vehicle submenu appears in the multifunction display.
^ Press and keep pressing the scroll forward/back button (S110s1) until the Compass settings message appears in the multifunction display.
^ Press Mode key 2 x to return to the compass display and to save the displayed compass zone.
^ Enter compass zone using the buttons + and - for setting specific functions and volume control.

Examples:
^ Location San Francisco:
The North America zone map yields
compass zone 4.
^ Location Berlin:
The Europe, Africa 8. zone map yields compass zone

^ Location Bonn:
The Europe, Africa 9. zone map yields compass zone To achieve as accurate a course display as possible, it may be necessary under certain conditions to change the compass zone during a route. For example, when traveling from Bonn to Berlin two compass zones are passed through (cf. examples).

Earth's magnetic field
The compass uses the earth's magnetic field to determine the cardinal points.
The earth's magnetic poles (North/South) deviate however slightly from the geographical poles. When compared with the earth's axis of rotation, the earth's magnetic axis is inclined by roughly 20°. If the earth's magnetic field is to be used for determining the cardinal points, then correction factors must be considered for various earth zone.

To this end 15 different compass zones are calculated. At each location within a zone the deviation (declination) is approximately identical.
If the correct compass zone has been entered in the compass, then it can correct the geomagnetic data accordingly and thus display the route relatively accurately (±10°).