[AVGWarhawk]

I believe you will need to sink 10000# of shipping. However, you do not have to stay in the radius. If that is not possible with the fuel you have remaining, go back to Pearl. More then likely you will be sent back to this patrol area again to complete the mission. You can look at this way, if you run out of fuel your career is screwed. If you get back to Pearl it is POSSIBLE your career is screwed because you did not sink ships. Either way, you could be screwed. I would head on home and see what happens. You might get lucky and sink some vessels along the way fulfilling the requirements.