I'm figuring no contact outside the world you're in, so that leaves us with post offices. Probably small 20-foot tall uncomfortable "News Stands" that jump from world to world, updating and transmitting information. Probably just radio and mail, with little to no real "Internet", as I'm picturing computer technology closer to Mother than Microsoft.I've got a question: how is communication handled between Earths? Is it possible at all via some kind of transmission, or do communiques need to be couriered via some kind of traveling post office?
As I figure you only show up in water if you screw up (let's say there's some readings before you jump that a trained professional will go "dude, we gotta move or we're sunk"), or you choose too (there's nothing wrong with making a fort water-tight--at least you keep things clean), so you could jump mid oceanic if you want--that will probably cause at least a few HP of damage to the fort as "sudden pressure changes" also kind of explain explosives, but otherwise ok.You say forts can't be moved because they're as big as a building, but the obvious thing to try is to put them inside a ship. Arriving in a ship instead of an immobile building has some big advantages, as long as you can map you will appear in water. If you can't, then it's still a step up than being in a building which might appear over water and sink.