{HEAD ~ A terrain correlation system} for {TAIL ~ use} in conjunction with an inertial navigation system of a vehicle is provided which can update position information and which is both independent of altitude and compatible with varying course paths 
for
{ HEAD ~ A terrain correlation system } for { TAIL ~ use } in conjunction with an inertial navigation system of a vehicle is provided which can update position information and which is both independent of altitude and compatible with varying course paths
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