Does anyone know the formula that is used to calculate port upgrades? Specifically, I'm wondering about an upgrade from 11A to either 8B, 8A, or to a verandah. Right now, the cost to upgrade from an 11A to a 5B is about $600. What would we be looking at if we waited til we get to port? (Approximately, of course. I know there is a "sheet" that they have at port that tells what the fees are).