Ok I played SH3 and I had no trouble hitting things.
In SH4 .. i close in to about 1800feet/meters whtaever the reading is in, i click the lock button on the right hand side then the placekeeper button on the left hand side, set the torpedo to high speed and hit fire, a dozen times on a dozen targets and not a single hit.
What am I doing wrong ? I'm playing easy mode so the crew should be doing all the number crunching and if the other ships are evading and i have a "green" lock i should be hitting yes ??