Maybe a dumb question- the circles that appear when you click on a ship, these would be visual range and hydrophone range? Later modified to sonar and radar perhaps? I'm in Jan 1940 and evaded a V&W on the surface at night, but was paying particular attention to the circles- the smaller one had a pie-shaped wedge aft, which I assume would correspond to a dead zone for the hydrophones. Anyway, the visual circle extended well beyond the accoustic circle.
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