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