If it is a convoy I always attempt an end run attack. The enemy has radar and will pick you up if you get too close, even if you turn your set off. I do my best to stay outside the enormous visual range the AI has in TM. Unlike RL where subs tracked convoys by tracking the course of the smoke stacks, and smoke, SH4 you have to see the target's upper hull. When you do this, the eagle eyed spotters will see you, unless you are just on the edge of not seeing them (crazy I know, very hard, I know as well).
In SH4 Active sonar does not work correctly. It is my understanding Active was not used unless there was a reason. While cruising along at 9 to 12 knots, passive and active sonars were nigh on useless. But in SH4 the active seems to continously go off, and if you are in the cone, you are detected most likely.
Stay at least .2 NM outside the track of the nearest escort. As he passes your position, creep in at no more than 3 knots. Try to get deep inside the convoy, and hit the second line of ships, and dive deep.
Variations of this tactic seem to work for me. There are times I have gotten detected, and I end up diving deep and becoming a hole in the water.
Others may be able to explain tactics better than I can. I just do what seems most appropriate, and have a difficult time explaining what I do.
Good luck
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