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Acoustic navigation provides a method of tracking a ship, and an underwater vehicle or instrument package ('fish') in the deep ocean. Acoustic devices attached to the ship and fish measure the length of time it takes a sound pulse to travel to acoustic transponders moored on the ocean floor. When the transponder positions and the average speed of sound are known, the ship and fish position can be found. This report describes a system for real time acoustic navigation developed, and in use, at the Woods Hole Oceanographic Institution. It includes a brief discussion of the electronic components, operation, mathematical analysis, and available computer program.
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