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Old 07-08-2018, 02:28 AM   #1
Mussalo
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Default Sound buoys

Just read Iron Coffins by Herbert Werner and in the book he decribes how, while piloting an u-boot near the coast of Ireland in September -44, he encounters sound sources sounding like propellers and sonar pings. Further on as he checks the surface to be empty of ships, he explains these sound sources are buoys that generate sound scattered around the coast to drive u-boats further to the sea.

I searched information about these kind of devices used by the British but could not find any.
If anyone knows about these, I would be interested to know how they worked: did they run on batteries, did they had radio recievers etc.
Also would be interesting to know what countermeasures the Germans took on these if any.
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Old 07-08-2018, 03:52 AM   #2
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I've not heard of a separate bouy that produced sounds as described. The British did use what they called "foxers", a sound generator towed behind a ship to fool acoustic torpedoes.
https://en.wikipedia.org/wiki/Foxer

I looked at NavWeaps without success, but you might have better luck.
http://www.navweaps.com/index_tech/index_tech.php
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Old 07-12-2018, 01:53 AM   #3
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He could have been picking up a CZ contact, seems the most likely to me.
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