Escort speed also had an effect on detection, both modern and WWII era. I also find that an escort in SH4 can still hear you in its baffles/prop wash, as the escort went by I would speed up as I entered the area astern of the ship where I thought I couldn't be detected only to find they could hear through the propellers!
In SH2 the we had Uber Destroyers, in SH3 with GWX I had DD's making dry runs for hours with no more depth charges, and in SH4 the japs were OK but the Allies couldn't find you at all....
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