As a few have said before: the decoy is only good to "mask" the noise of your boot. It was not designed to fool Asdic but to mimic the sound of prop noise. As JB said if you are prentending to be a hole in the water, never use a decoy. If you are getting hammered by the Tommy DE's, flank speed, release decoy, knuckle hard left or right, wait till you are on a straight course, then order Kleine Fahrt.....all good!!!!
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