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