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Why should it be necessary to conceal the use of D/F?
Why should it be necessary to conceal the use of D/F? Who was not using D/F at that time? I even seriously doubt that it was really necessary to conceal code-breaking. Did e.g. the British realised to which extend the Germans and Italians could read their codes? And which US codes were broken?
The aircraft was likely necessary to confirm the position, because there were not constant radio emissions for D/F.
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