in 100% realism, I run at 30 meters, pass through the dd umbrella and go to periscope depth when Im around the middle of the convoy (a little ahead of it). This way the vessels are much closer (around 500/700 meters) and I donīt need to use the tdc for the nearest targets, using both bow and stern torpedos indiscriminately :p .
Is a bit of a mess when they start evading, but you should be able to take down a few.
A task force is another story, they are usually faster and more dangerous, no time for hide & seek. If Im at a good firing position ahead of them, I take my time to get a good solution and go for the biggest prizes (carrier or battleship).
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