The german and british navies used for their WW2 submarine officers an "attack teacher" machine, that is more or less a WW2 version of a game. Officers looked through a periscope and saw ship models placed on a surface and moving along. They issued orders and the assitants recorded their movements, plotting sub and enemy and the training officer told if they did it right or not. It was used to practice AOB and range estimation, as well as general approach tactics, and it served apparenty well for its purpose.
So I suppose that SH3/4 would indeed be a good trainer for SOME aspects of WW2 submarining, specifically attack tactics, situation awareness, ability to represent in your head the current tactical picture, etc.
But not much more than that.
