A device to detect the location of a plurality of magnets uses a plurality of {HEAD ~ magnetic sensors}, having {TAIL ~ sensor elements} arranged in a known fashion 
having
A device to detect the location of a plurality of magnets uses a plurality of { HEAD ~ magnetic sensors } , having { TAIL ~ sensor elements } arranged in a known fashion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH