One thing this game teaches you pretty quickly is that there is A LOT of ocean out there, and one tiny u-boat just can't cover all that much area. As folks have mentioned, there are of course sea lanes that we can patrol around/through, but a lot of things have to go right to run into a convoy. Remember too that, at best, you can cover about 12 nautical miles/hr. To put that in perspective, the English Channel is about 300 nautical miles, or just over a day's travel, on the surface, at full speed.
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