If you have problem spotting your target, then your target has problem spotting you (you're smaller, remember!).
When it's far, try to calculate his course and speed asking informations to watch officer. Draw his course and speed on the map, and then find a route that will bring you at 500- 800 meters @ 90° from his path...
As soon as you understand you have enough time dive and move underwater (keeping periscope down as much as you can, since you have already calculated his path, you don't need to watch your prey anymore!).
When you are in a good firing position stop the engines, raise the scope when he is about at +-50°/60°, in order to make the final check of your firing solution and, if necessary, a small correction on your firing position.
Wait untill you can fire at +-5° and then fire 1 torpedo (2 if it is a big ship, in bad water or if you are not completely sure of your solution)
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