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electronic compass with compensation for missvisning, procedure to compensate missvisningen and radio communications system for implementation of the procedure
electronic compass with compensation for missvisning, procedure to compensate missvisningen and radio communications system for implementation of the procedure
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机译：电子罗盘，可对失踪进行赔偿，对失踪进行赔偿的程序，以及用于实施该程序的无线电通信系统
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摘要
The invention provides a solution to the problem of providing an inexpensive and simple compass unit which, nevertheless, compensates automatically for different deviations in the Earth's magnetic field at different places in the world. Briefly, the solution involves an novel electronic compass unit, a method in the operation of the compass unit, and a cellular radio communication system. An electronic compass unit constructed in accordance with the invention and located within an area covered by the radio communication system receives information concerning the local magnetic deviation from the correct direction to the geographic North Pole from a data storage unit which is central to the system, through the medium of a connected radio unit. Information concerning the local magnetic deviation is sent from the central data storage unit to respective radio units from a radio base station situated close to said radio unit, via a downlink.
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