Steamwake got it dead right. If you chase targets, or try to intercept them at any kind of speed, the chances are any escorts will detect you.
Best way is always to get ahead of the convoy, manoeuvre your boat so that you end up ahead of the convoy, facing at a right angle to its course line; run silent, rise to periscope depth and wait for them to come to you. Use the traces on the map to keep an idea of the targets' course and distance; use the 'scope as little as possible - just what you need to work out your firing solution(s). Fire, then dive and turn - still running silent. If you want to see the fireworks, you can always use the external view, rather than the periscope.
Go get 'em.
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