Functionally they weren't compromised in enough time to really matter for the bulk of the BotA, it was instead HuffDuff that enabled the Brits to figure out where Uboats were stationed and route around them.
Worse than that - KM officers complained that all naval radio transmissions were to be limited to 3 character messages as per prewar guidelines, but Donitz Wolf Pact tactics demanded constant communications of lengths far beyond 3 characters .RN studies showed sometimes these transmissions numbered over 100 per hour per boat. Why that persisted is beyond me. Furbringer [Donitz's colleague] sited this as main prewar criticism of Donitz Wolf Pact tactics. Furbringer recommended a multi dimensional attack on convoys to overwhelm the defences, with LW air attacks and surface raiders. If the LW component was just a fleet of long range MPA [ even CONDOR], they could broadcast convoy location thus eliminating the need for hundreds of U-Boat transmissions per attack.
Really- Donitz didn't want to command the U-Boat fleet at war, but Raeder seems to have cornered him into it . Perhaps if Donitz leveraged Dr Walther's "fish boat" U-Boat development , while Furbringer orchestrated the U-Boat war , they could have had the best of both worlds. Furbringer lead the TYPE-VII U-Boat development in the 1930s and trained most of their prewar crews, and himself championed a number of technologies, like rocket torpedo and sonar masking materials.
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