Lt. Hirsch points out that the Germans would be able to "triangulate" the position of the U-571 if the nearby S-33 attempted to transmit any kind of radio message. This is called Radio Detection Finding (RDF), and before 1944 the technology did not exist to do this with any degree of accuracy. The distances involved in locating U-boats in the Atlantic from shore-based RDF stations were so great, and RDF accuracy was relatively inefficient, so the fixes were not accurate and the response times so great (more than ten days) that the allies could have transmitted whatever they wanted without fear of reprisal. If, however, the allies attempted to send a fake, uncoded message to the Germans that everything was okay, the Nazis would have recognized the deception, and the Enigma mission would have been severely compromised.

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