If you're using OHII, you can sink one ship in your designated patrol area that should be enough to meet the requirements. Make sure it's a Passenger/Troop transport or a Freighter. As said, anything "on the way too it" doesn't count. It just adds to your total tonnage count... which is ok. Don't pass anything up that's worth while. I leave those puny Coastal boats alone. 
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Gary
No Borders, No Language, No Culture =s No Country
I'm a Deplorable, and proud of it.
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