In Catan Seafarers, in a scenario like Fog Island where hexes are unknown, can you build a settlement at an intersection of a known hex and an unknown hex and if you can, do you uncover the unknown hex or does it remain a mystery until a ship actually is adjacent to it?
1 Answer
From p12 of the rules (emphasis added),
If you place a ship or road that connects to the intersection of an unexplored hex, you must immediately draw the top hex from the pile and place it face up in the empty space.
If you can ever build a settlement on an intersection, you must already have a road/ship connected to that intersection, so all those hexes should already be explored; exploring does not require a road/ship to be built on one of the hex's edges.