I found this interesting article on slashdot.org this morning about Seasteading. Interesting ideas in the wired article, and a full book on the subject is here. I have always been fascinated with the development of a system of government. In particular I have always been interested in Sealand. I have to confess when it was up for sale I bought extra MegaMillions tickets to see if I could be lucky enough to win and buy the damned thing.
If your in deep water your immune to tsunamis, and your not in range of a nuclear target, it might be the ultimate retreat location. Never mind your on the open sea, and if you want to buy a RPG, you can! Between aquaculture and gardens on the roof you could keep a family fed quite well.
I'll read the book, and post again on the subject if it's worth the time.