It only works when decoys become available, but also, turning into the mass of ships is a good tactic anyways, as it usually points you in the direction the DDs are coming from, giving them the smallest target to get a lock on. Getting down deep is also a good thing as it combined with the other ships helps to mask your sound.
A good thing too, as long as there is no trailing DD off the back of the convoy or task force, is to head that direction once you are in the middle of them. I have escaped many time doing just that.
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A legislative act contrary to the Constitution is not law.
-John Marshall Chief Justice of the Supreme Court
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