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