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