I'd chalk it up to some friendly secretary at BdU deciding you didn't need to die this week. So go out just beyond German DD coverage, dive the boat, gorge the crew on all the fresh food, and booze, do a fuel dump and then come back a few days later saying you didn't see a thing at your assigned grid so decided to come back early for Bernard's important lederhosen fitting...
But actually yeah, it's just a Commander thing. You can either dock the boat at your base and get a new patrol grid or just consider it a free hunt and go wherever you think you can sink something.
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