After reaching an objective and you find the shipping sparse you can go anywhere and sink enough tonnage to complete the mission. Go out of your patrol area and go to a known hot spot, sink a few ships.
I just completed a reach and sink mission to Caylan Island in the Luzon Strait by sinking two ships in the Mindoro Strait. After reaching the area and finding nothing I went to the Mindoro and found plenty of action.
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