It depends. Kind of a hit and miss. Best way to get close is in light to medium fog. But I just sank a town lend lease destroyer that appeared on my bow at 6400 meters without spotting me (night).
Basically you should not get within 5Km when the weather is fine. Better dive and full speed ahead for about half an hour depending on intercept course and their speed.
If they are way faster I leave it or just shadow them.
OLtzS Ashikaga
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