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Old 11-14-09, 04:19 PM   #2
Méo
Ace of the Deep
 
Join Date: Aug 2009
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In the meantime i found that u-boat could hear a convoy (if speed ≤ 4 knots) up to 50 nautical miles. Seems like a lot to me.

http://www.uboat.net/articles/id/52
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