At the moment there is a problem with the tonnage bar not filling up . Trying to figure that one out . Other than that , here is an over view of the realism that my mod list gives you .
http://www.subsim.com/radioroom/showthread.php?t=192374
Waves are rolling and makes it hard to sink targets in heavy waves .
Damaged ships use a smoke screen .
Some nights are dark like in real life .
IRAI mod makes the AI unpredictable and extremely difficult .
Real navigation makes it possible to get lost on the map .
No childish yellow trasers from planes or ships .
No ability to load previous saves .
A whole lot more as well . Extremely difficult to stay alive like in real life .