The system comprises {HEAD ~ a plurality} of {TAIL ~ magnetic sensors}, each of which is oriented in a known direction and generates 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 { HEAD ~ a plurality } of { TAIL ~ magnetic sensors } , each of which is oriented in a known direction and generates 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 HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH