One method i use is: On the way to your patrol station, keep an ear on the radioed reports of convoys, TF's, single ships close to that station; Use your map marker tool to plot their course for oh, say 50 miles each. After a few days a pattern will plot out, and from those you can get a "Corridor' or shipping lane. It might be a bitt out from your actual zone of patrol (Lucky you if it is) but just get your grey star, and then go get lunch.
Hope that made sense.
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