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Old 12-05-10, 09:37 PM   #2
Randomizer
Stowaway
 
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According to an article on U-Boat.net they did use VLF but only one way transmissions were possible.

See:

http://www.uboat.net/articles/35.html

There's a table there that shows reception depth varied with range, down to 30m in the Bay of Biscay but only 17m in the Indian Ocean.
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