If you think that's hard try with no map updates at all. You have to plot everything by hand according to your observations and make sure your scope is not detected. Towards the end of the war this becomes quite the challenge!
For single contact the best way is with the hydrophone as already mentioned. There is a nice Hydrophone tutorial on this site so check it out.
For convoys hydrophone can be misleading since you keep picking up the front escort that doesn't keep a constant bearing and speed but sprints and drifts all over the place. The best approach is to use your scope sparingly to plot the convoy's rows.
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