Here's what I do during the day (not that I know anything). Edge in towards convoy until you can get a visual range and bearing. Plot on chart along with elongated line in direction of travel. Retreat back outside visual range and steam ahead of convoy. Check every 2 hours on hydrophone and plot direction of contact on chart. where it crosses elongated line above is convoy position (approx. typical convoy covers several Kms). Knowing the speed of convoy you can check distance travelled in those two hours. If this doesn't tally reasonably well with what you've plotted, the convoy has changed course. Rinse and repeat 'till nightfall. I try to keep convoy at my 4 or 8 o'clock roughly so I am well set for an attack soon after dark.
It's simpler than it sounds.
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