68. Magnetic Declination
Little Navmap uses the magnetic declination which is stored either with VOR stations (calibrated declination) or the actual environment declination. The latter one is calculated by the program using the world magnetic model. (WMM) or loaded from the simulator scenery database.
Note that the magnetic declination of a VOR (also: calibration for VOR, VORDME and VORTAC) may differ from the actual declination in a simulator region as it does in reality. The calibration of a VOR might be very old while the real declination in the environment changed in the meantime due to the movement of the magnetic poles. Therefore, magnetic course values might differ when flying inbound or outbound a VOR.
Little Navmap offers several options to display course labels along the flight plan line using
VOR calibrated declination or not. This can be changed in
Options on page Map Display Labels.
See Flight Plan for more information on the labels and Magnetic Declination for more information about declination and scenery databases.
Futhermore consider the different departure and destination true courses for Great Circle routes. These appear at long flight plan legs.