Lest anyone be concerned that the new, realistic, NYGM TW 2.0 escort sensors are too sensitive (as they will appear to be on first encountering them), let me cite some examples from my own testing. To make it tough, in Sept-Dec 1944 (North Atlantic, North Sea).
The real trick is to go to silent running at 1 kt, at the deepest depth possible. I find the stealth meter to be indispensable. While this may sound like cheating, I've always taken the view that, whereas the real captain had a crew of 50 to tell him who is close and who is not, the SH3 captain has to derive the same information from the computer - via the stealth meter.
In practice:
a) Convoy attacks - always approaching these 12-escort late war convoys submerged, towards the edge of the convoy. Firing from outside the screen usually, but if necessary move in under the merchant ships to make the escorts' job harder. Naturally, fewer sinkings than previously. One of the new un-nerving aspects of attacking convoys is when it suddenly turns towards you.
b) Caught by hunter-killer group of three destroyers in North Sea north of Scapa Flow, while trying to return to Bergen. After about half an hour of real time, managed to slip away (deep water).
c) Attacks on two of the new UK east-coast convoys in shallow water - evaded escorts quite easily actually, but forced to fire from so far away that only one ship sunk from each convoy.
d) Caught by two warships while trying to enter Rosyth harbour (shallow water). Again, evaded finally.
After a day or two (real time) to learn the knack of avoiding the escorts, suddenly everything has become a much more exciting challenge. Brilliant work again by Observer (hydrophones/asdic) and Teddy Bar (sightings/radar)!
Stiebler.
NYGM Tonnage War Mod - Leading Edge Realism