Mark and make tracks
I'd take note of the general direction of the convoy heading and speed. Try to work out their position in say, 12 hours or when it's dark.
Mark the map ahead using the ruler as to where you think they might be at that time in the future.
Turn away, surface as soon as out of contact, and race ahead to the marked spot. With luck you will be able to get there before they do.
If you can't better their speed on the surface, give that one up and look for easier prey.
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