The B-Dienst operators were very good at intercepting and decyphering Allied radio traffic to discover the locations of ships. Infact its a little known part of the war that the Germans read many Allied messages just as the Allies were reading Axis Enigma traffic. I think one of the reasons that ULTRA intelligence was so well guarded and used only very sparingly was fear that the leaky Allied radio net might give the secret away.
Back on topic I think reducing the number of lone ship radio contacts would probably be a good thing, might reduce tonnage to a more realistic level.
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