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