providing a self contained apparatus comprising a processor, a display, and {HEAD ~ an array} of {TAIL ~ inertial sensors}, all operably connected 
of
providing a self contained apparatus comprising a processor , a display , and { HEAD ~ an array } of { TAIL ~ inertial sensors } , all operably connected
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH