Patent ID: 7574282

Claim:
Method for maneuvering a self-propelling device ( 5 ) towards a navigational control station ( 3 ) by means of an electronic navigational control system comprising at least said navigational control station ( 3 ) with at least one loop ( 4 ) connected to at least one signal generator ( 1 ) and one sensing unit ( 14 , 15 , 16 ) arranged at the self-propelling device ( 5 ), whereby the sensing unit ( 14 , 15 , 16 ) at least senses an, in the air-medium propagating, time and space varying magnetic field, transmitted by the at least one loop ( 4 ) and in turn retransmits at least one, by the sensing unit ( 14 , 15 , 16 ) processed signal to at least one drive source that contributes to the device's ( 5 ) movements across a surface, the signal generator ( 1 ) sends a current through the at least one loop ( 4 ), the current generating the time and space varying magnetic field ( 43 , 44 , 52 , 54 ), whereby the sensing unit ( 14 , 15 , 16 ) maneuvers the device ( 5 ) based on the properties of the sensed magnetic field ( 43 , 44 , 52 , 54 ), characterised in that said sensed magnetic field ( 43 , 44 , 52 , 54 ), in an area enclosed by said loop ( 4 ), at least at one point of time has different directions ( 50 , 51 ).