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Don't forget the marvellous input of Ultra (Bletchley Park). I believe the U-boat commanders were required to pass a Position Report to the Kriegsmarine every 24 hours.
Once the codebreakers had broken into the German Naval "Enigma", this enormously simplified our task in the Battle of the Atlantic.
Breaking Triton had a big impact but you have to figure in convoys and long range air support in that. There was a time lag in decrypting ultra material. As the war progressed the U-boatwaffe started to loose its most experienced commanders.