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Originally Posted by Catfish
"MAD" Magnetic Anomaly Detection in 1945 ? I know the magnetic changes in the sea-floor were detected accidentally by searching for russian subs in the 1960ies with those devices (thus giving an evidence for sea floor spreading, and plate tectonics -> Wegener's theory), but in 1945 ??! I doubt this, but will have a look for it and post here again.
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http://www.history.navy.mil/avh-vol2/Appen3.pdf
Note: U-761, 24 February 1944, U-731, 15 April 1944, U-392, 16 March 1944.
Also you need to read the intro
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Technology used by both sides in the conflict improved dramatically as the war progressed. On the Allied side the advantages of ASDIC, aircraft-borne radar, MAD gear, rockets and homing torpedoes temporarily offset wolfpack tactics and improved AA weapons.
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http://www.history.navy.mil/avh-vol2/chap4-4.pdf
Go to page 489 and you will see a picture of a PBY-5A equipped with MAD gear