In view of {TAIL ~ the foregoing}, it is a primary object of the present invention to provide a system, method, and apparatus for determining {HEAD ~ relative position} underwater 
In view of { TAIL ~ the foregoing } , it is a primary object of the present invention to provide a system , method , and apparatus for determining { HEAD ~ relative position } underwater
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH