{HEAD ~ A terrain correlation system} for 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 {TAIL ~ varying course paths} 
is compatible with
{ HEAD ~ A terrain correlation system } for 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 { TAIL ~ varying course paths }
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