The reference map transformation values are used in conjunction with {HEAD ~ a terrain correlation process} to establish {TAIL ~ vehicle position} 
to establish
The reference map transformation values are used in conjunction with { HEAD ~ a terrain correlation process } to establish { TAIL ~ vehicle position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL