I play without the auto map updates too. In most cases it is more realistic and requires more thinking from the player to keep good awareness of the situation.
The only thing I that really annoys me is that the sonar contacts are off too. Once I THOUGHT I got chased by a destroyer and there where actually THREE of them -.- The sonar guy just couldn't really give me a hint in which directions they were, mostly just one of them at once.
I COULD place myself at the hydrophone all the time to get around this, but then I would not see whether the DC's shake the boat or not.
And besides I am the CAPTAIN and not the SONAR GUY
So is it possible to leave just the sonar contacts on the map on and visible contacts not ? The whole plotting-by-sighting thing is cool.
*wave*