I definitely know wave size plays a large role in visual detection by dd's also.
At night, in medium fog, with a 15ms wind, while I was on the surface, I had a lone dd cross my stern on a perpendicular course at a range of 500m. It just kept right on going.
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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.
http://www.hackworth.com/
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