High Quality Content by WIKIPEDIA articles! In oceanography, a sofar bomb is a long-range position-fixing system that uses explosive sounds in the deep sound channel of the ocean, where the speed of sound is minimal. A position is determined from the differences in arrival times at a known geographic position of signals sent from elsewhere. The useful range from the signal sources to the monitor station can exceed 3,000 miles (4,800 km). Dr. Maurice Ewing suggested putting small hollow metal spheres in pilots' emergency kits, which implode when they sink to the sofar channel, acting as a secret homing beacon.

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