The processor also calculates values related to an actual magnetic field strength using the set of signals from the magnetic sensors and determines values related to the location of each of the plurality of {HEAD ~ magnets} based on {TAIL ~ a difference} between the values related to the predicted magnetic field strength and the values related to the actual magnetic field strength 
The processor also calculates values related to an actual magnetic field strength using the set of signals from the magnetic sensors and determines values related to the location of each of the plurality of { HEAD ~ magnets } based on { TAIL ~ a difference } between the values related to the predicted magnetic field strength and the values related to the actual magnetic field strength
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