One ~HUGE~ difference between the real SJ and the game's version is land masses, or lack thereof in the game. If you would happen to see a PPI screen on a real sub back then, there was a lot of "clutter" that would show on the screen, and interfere with seeing ships. An experienced operator could navigate by radar, but an enemy combatant could hide in the "clutter" along the shoreline reflections. For the most part, not so in the game. Sonar is very similar in function in the game. "Land mass? What land mass? I don't see no shtinking land mass!... ??" and you can "see" a sonar line around most islands. Of course, the senior operator can hear a mackerel sneeze at 16 klicks...
