I happened to have a copy of this handbook that came with an older subsim, called "Drumbeat".
I never read it when I was playing that game, but now that I'm playing SHIII, I'm finding it quite interesting. And I actually employed one of the tactics listed in the book last night!
In the section "Defensive Action and Pursuit by the Enemy" the book suggested turning the "narrow profile of the boat" (i.e. bow or stern) towards the source of the enemy's pinging. I guess the idea was that this would present less of a surface for the soundwaves to bounce back. I'm not sure if this actually helps in the sim, but at least it was something to try....
Two destroyers were hammering me pretty hard for nearly two hours of real-time play – the worst depthcharge attack I've ever faced and lived – but I got away with just some minor flak gun damage.
I'd say my reading paid off on that count alone!
