In heavier seas, you don't know exactly at what depth the toropedo will pass under the keel.
If the ship has a keep of 10m, and you set depth for 11m you should sink the target. But if due to heavy seas it passes say 3m under the keel, it may do precious little damage to the target.
I believe in real life by the time the Germans got their magnetic pistols figured out, the allies were already degaussing their ships.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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