I find myself needing to get extremely close to ships to be able to clearly see their flags. I had been using GWX which increased the zoom a little on the periscope, but now I am giving NYGM 2.4 a go and I am fairly sure it does not zoom it more. (I may be wrong though.)
So I was curious, what kind of distance would real u boats be able to clearly identify the flags on ships? Obviously some stand out more than others, but still.
Thanks for your replies.