It really works for me. Since I've been doing it this way that lead destroyer just goes sailing along like hes on moonlight bay....not a care in the world.
Before, I always saw that masthead light pop on and here he would come. Collision course. Splash...splash..splash...
Only thing is ...if you are doing manual targeting forget getting AOBs, ranges, speeds and all that for those perfect periscope solution shots. (well unless you are a heck of lot faster than I am ) You have to have your tubes set for dead ahead shots and lead your targets like shooting birds with a shotgun...which is okay too since this way I can take out 2 maybe 3 targets....before I head back down into the deep.
If I were doing the full manual calculations then I would be lucky to get one from a convoy....and most likely I would get clobbered before I was even halfway ready to shoot.