{HEAD ~ The system} includes {TAIL ~ both a satellite positioning system} and a non SATPS unit for obtaining position data 
includes
{ HEAD ~ The system } includes { TAIL ~ both a satellite positioning system } and a non SATPS unit for obtaining position data
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH