FIG 5 illustrates {HEAD ~ a block diagrammatic view} of a navigation system employing terrain correlation system of {TAIL ~ this invention} 
FIG 5 illustrates { HEAD ~ a block diagrammatic view } of a navigation system employing terrain correlation system of { TAIL ~ this invention }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL