If low vis is really bad there isnt much point in trying to get ahead of the convoy and intercepting it by the book,your best bet would be to race into the convoy itself at night on the surface (ideally with decks awash,7-8m),preferably from the rear keeping your bow towards them as much as possible to lower your silhouette,and fiercely attack from within,as you will be at close range and able to properly steer the UBoat towards your chosen target/s.Still,a very risky affair.
You are fortunate its only 1939,the escorts will be minimal and poorly experienced at this point,wait until you hit late 1942,and radar is your greatest enemy,not the weather.
If in doubt,leave it
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Best Patrol: 10 merchants + HMS Nelson for 68.056 Tonnes
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