I get "dead-on" results with the 3:15 rule. That is to say, the torpedoes go right were I aim them. (At least they do in calm seas

.)
When I first started playing the game, I thought it was crazy-talk to hear other players say they could target a specific area of a ship. I was just trying to
hit a ship!
I suppose it would be more correct from a simulation POV to judge the speed with the hydrophones?