[AVGWarhawk]

I do not believe all ports or any of them will let you refuel unless they have the anchor showing. I also noted there are two different types of anchors. Each has a different texture so I do not know what they mean yet. My current career shows these and I'm going to try the port with the differently shaded anchor. At any rate, you need to set your cruising speed at 10kts. This was the historical speed as per the book I'm reading called 'Unrestricted Warfare'. There was enough fuel to make Japan from PH at 10 kts, 3000 miles of actual patrol and return back to PH. Bear in mind this came from Dick O'kane. For realism, you need to keep an eye on your fuel. They all did. I believe the fuel is modelled well. What I do, when I hit the half tank mark, I see were I am and make my decision to keep patrolling or head home.