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Old 05-17-11, 10:02 AM   #6
Jimbuna
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The S-Gerat (Special Apparatus for Active Sound Location) was essentially sonar. It transmitted sound pulses and timed the returning echo to detect underwater objects. Because it emitted sound pulses which also broadcasted the U-boats location, this device was not very popular. It could detect objects up to 4,000 meters away.
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