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Sofar bomb
In oceanography, a sofar bomb (SOund Fixing And Ranging bomb), occasionally referred to as a sofar disc,〔http://www.youtube.com/watch?v=EuhccACOd1U&feature=channel〕 is a long-range position-fixing system that uses explosive sounds in the deep sound channel of the ocean to enable pinpointing of the location of ships or crashed planes. The deep sound channel is ideal for the device, as the minimum speed of sound at that depth improves the signal's traveling ability. A position is determined from the differences in arrival times at receiving stations of known geographic locations. The useful range from the signal sources to the receiver can exceed .
==Design==
For this device to work as intended, it must have several qualities. Firstly, the bomb needs to detonate at the correct depth, so that it can take full advantage of the deep sound channel. The sofar bomb has to sink fast enough so that it reaches the required depth within a reasonable amount of time (usually about 5 minutes).
To determine the position of a sofar bomb that has been detonated, three or more naval stations combine their reports of when they received the signal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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