Most times early in the war, you can get speed with the Matching Speed method hours before your actual attack.
A torpedo will intercept all targets on a Specific AOB and Speed regardless of range.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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