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Old 05-03-07, 08:11 AM   #2
Bane
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Join Date: Apr 2005
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The sonar pings use the mass of your sub. They send a ping from the DD, the sound waves travel to your sub and are reflected back to the DD. They can calculate your postion by using the time it takes for the sound waves to return.

The best defenses against this are to go deep, preferably under a thermal layer which will bend the sound waves like a prism, and to present the smallest profile to the DD as possible.
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