What the heck?
its a bloody Simulator
the only thing that it doesnt simulate YET
is HUMAN ERROR'S and its Lack in behaviour.
its still simple AI behaviour, well in simple terms ofcourse

, it still follows some basic protocols , but the sensors are like..lets say that you making a piramid out of a stack of cards.
1 mistake can mess everything up.
it aint a easy task to do,
but keep in mind it does work, but the situation has to be suited for the sensors to work properly
I have been in situation when I spotted a DD 500 meters on the right of me. not shooting nor searching me
1 , it was pitch black , just barely made out the shape of the DD
2 , I didnt do anything (attacked a ship) , so his sensors where probally Passive.
well, still as a simulator I holded my breath seeying that sneaky bastard 500 meters away from me (or was I the sneaky bastard?

)
I could crawl in moderate sea wheater, night, with some fog about 1000 meters from a convoy on the surface in early 40, but it took me darn long time before I got that close. I didnt use TC, and was going very slow.