Once to get to a destination and are told to find ships to sink... You don't have to stay in that particular part of the grid... I did this in my first patrol and stayed in my little grid square forever combing it for ships... no ships EVER came through that grid... after hours and hours of of following plotted courses in that grid, I gave up for more fruitful territory... after I sunk a few ships(outside of the assigned area) I achieved my mission goal, so you don't have to stay to that area if nobody is there.
Remember that you have to get to the destination before you sink the ships or they don't count toward that mission.
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