Many thanks for your answer, Marco !
I found others informations about "Fox Schedule" and radio communication in Blair's book.
Page 309 :
"[...] nightly Fox schedules contained not only operational orders and informnation on Japanese movements but also personal messages to officers."
Pages 377 to 378, a very interesting part :
" Christie was not satisfied. He launched his opwn private investigation, studying the radio dispatches to the missing submarines. His conclusion was that Fife, like Doenitz, had been talking too much to his boats and requiring them to talk back too much and shifting them around too much. In a tough letter to Fife wich severely strained the thin "cooperation" existing between the two commands, Christie said in part :
Radio dispatches concerning Grampus and Amberjack totalled 106. Forty-six of these were reports of positions of submarines for higher command. Many of these dispatches gave specific names, locations and times.. We have in numerous instances intercepted enemy transmissions revealing the positions of our submarines and ordering counter measures. Submarine transmissions have been repeatedly and expertly DF-ed. The obvious solution is rigid adherence to the fundamentals of radio security, particularly the elimination of all but essential traffic. The amount of traffic put on the air should be a minimum for reasons of external security. The number of addresses should be a minimum for reasons of internal security."
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