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