If it's going less than your highest speed, say 18 knt's, close in enough to be seen so it will start zigging. If escorts come at you, turn and put your tail to them and usually they will turn back. Now that you have them zigging, you can attempt an end around.
If it's merchants, seldom gonna go that fast. Stay out of escort sight and try and slow one down with the deckgun. If they don't see you, escorts won't come. You slow down one, they all slow down. I don't recall many convoys going over 17knts. They can only go as fast as their fastest ship, so with some ID you can figure that out.
All else fails, look forward to the map. Almost always they headed to a port or battle. Hang back and try to keep them in Radar Range so they don't do the vanishing act. Many times they will make radical turns, often even coming back your way..TF do this often, convoys seldom. If you see them make a radical turn, you know your not gonna catch them, so keep going straight, they turn back, you'll be closer. If they have a base track, you can often get in position. I don't know how many times I've track TF and they finally turn and come back. Many are programmed to almost backtrack themselves.
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