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Originally Posted by Steeltrap
At any sort of speed the passive detection array of a DD is next to useless. The fact is the overwhelming majority of sub hunting by escorts relied on active means (sonar/asdic).
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At speeds over 12 knots early in the war, and 18 toward the end, even active sonar is a no-go. It projects a high-frequency beam, but it's still limited to the speed of sound and subject to disruptions from the turbulence around the hull.