The GW mod has an excellent damage mod. Some say even too good. Smaller ships should go down with 1-2 fish, bigger ones need more 2-4, depending on which and where you hit them. Tankers usually need 1 torpedo, again depending on where you hit it.
If you use your external camera, always go chech if the screws are turning! If they are, wait for the boat to sink and if they aren't, you can go hunt others.
It's preferable that you stay near a damaged ship as you will have positive confirmation that she sunk.
You do know it sometimes took hours for ships to sink!
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