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