Are you talking about a single target, or a convoy. What dates are you working from? Does your boat have radar?
This should work for a single contact;
When you first sight a contact, draw a line along it's anticipated course on the map. This gives you reference point as to which way the target is heading. Next, get in front without getting sighted. Go to flank speed if it looks like you don't have that far to go. Trying to overtake a contact from behind is a losing proposition. A stern chase is a really long chase. You want to do an end around and get out in front.
Once you are out in front, turn into the target, set a course directly at him. When the target gets close to you, submerge. If the target is a merchant ship. you don't have to worry about being heard, but it's a good idea to keep periscope up only for a short time. The sound traces are your best friend in this situation. Maneuver to a point about 1000 yards off the track you drew (You may need to adjust the position of the line you previously drew as the target gets closer). You want to set yourself up at around 1000 yards off the track of the target, lined up for a 90 degree shot. Use the TDC to lock on and wait for the arrow on the target in the periscope to go green. Be sure to open outer doors, (The Q key) before shooting as giving the order to shoot with doors closed will usually make you miss. (Takes time to open the doors). Nail the b*****d.
If your target happens to be a was ship, usually a destroyer you will have a more difficult time. Attacking destroyers was usually discouraged. since they are a lot faster, they have a tendacy to hear a torpedo and avoid it. Then you can be in for a bad time.
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