A relative positioning system enabling a user to return to {TAIL ~ a starting position} or some other point on {HEAD ~ the users path} 
A relative positioning system enabling a user to return to { TAIL ~ a starting position } or some other point on { HEAD ~ the users path }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD