You should calculate out their course for a good long distance (be as accurate as possible), stay out of visual range but inside radar range and get in front of them, give yourself as much time to set yourself up as possible, there's no rush. In most cases try and stay at least 10 - 15 nm from your targets. When calculating course and speed use one of the frieghters as a reference, the escorts shift around alot and you wont get good readings from them, the freighters will all have the same course and speed. If your playing stock a good firing position is to be between the nearest side escort and the freighters, this gives you an optimal firing position and you can hide under the convoy once the depth charging starts. If it's a task force then you're better off going for the long shot (around 1500 yards from the nearest escort and 90 degrees to the course is a good position). I always wait to submerge until I reach my firing position, just make sure you never get within visual range of the escorts whilst on the surface. Once they get close make sure your on silent running/battlestations and try not to move unless absolutly nesacary(spelling?). Also, use the periscope as little as possible, especially if it's a daylight attack.
Good luck.
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