I know you must be in sight of 3 ships at least to send a succesful message. In this event, you will read your sent message in radioroom (M) with convoy grid, speed, course and sighting hour. Expect an air support within 1-2 hours.. if you are in the cover range, of course!
There is a Condor base near Brest, with a 800km of radius (see campaign.mis files in Data/Campaign).
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