We've used Greg Novak's "To Glory We Steer" AoS campaign system which was published in a US wargames magazine (the Courier?) back in the 80s I guess. It works very well. Also a system I developed for Form Line of Battle that, like TGWS, used an area movement system. For battles on the Lakes I have another area movement system that a friend in the US devised for a one day campaign (which I merged with a Warhammer Trafalgar variant that a friend in Australia put together based on my own small ship modifications for those rules - truly an international effort!). Iv'e also run a few "episodic" campaigns that run a bit like the old fighting fantasy game books (event happens - do yo do X or Y?) for specific campaigns such as the Belize and Nile campaigns.