The system comprises a plurality of magnetic sensors, {HEAD ~ each} of which is oriented in a known direction and generates {TAIL ~ a set} of signals as a function of the static magnetic field strength and direction due to each of the plurality of magnets 
The system comprises a plurality of magnetic sensors , { HEAD ~ each } of which is oriented in a known direction and generates { TAIL ~ a set } of signals as a function of the static magnetic field strength and direction due to each of the plurality of magnets
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH