I read in the book "U-boat Killer", the auto-biography of a well known escort captain's war time experiences, about how during Overload his escort group was assigned clearing the channel of U-boats expected to attack the landings. They said that they had many bad asdic contacts of large rocks and already sunken ships that might have been bottomed u-boats. Sometimes they'd depth charge long since sunken u-boats. The other thing was that the contacts were far from easy to make. The captain commented that he was lucky that his asdic operator was unusually qualified. Think of him being like "Jonesy" in Red October. Even then he was pretty hit and miss since a stationary sub bottomed looks a heck of alot like normal seabed detritus.
However the SH3 engine leaves alot to be desired. Hopefully SH4 might improve this. However the Japanese weren't the British so the experience won't be the same.
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