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Old 03-08-10, 02:29 PM   #14
Frederf
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Join Date: Apr 2005
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The GHG gear was mounted blow the waterline so should be able to hear some contacts while the boat is surfaced. Only the KDB gear is mounted above deck and has to be used submerged.

http://www.uboataces.com/hydrophones.shtml

The GHG should work at all times, the KDB should need to be submerged.
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