Was it different in CMC? There were a few rules that I forgot were specific to CMC. For example after you cancelled CMC and I started playing DoC more I kept not putting explorers on caravels for a while before I noticed that they had unit slots. I don't know, maybe I just tried to pass a fort that wasn't in my cultural borders once and thought it was a new rule that naval units can't pass period. Dang, that's really messed up my game.