Have to admit that this is not something I was aware of until very recently...but in my quest to broaden my YouTube channel to all things RC I found the Offshore Model Racing Association (OMRA). I contacted them and they invited me down to their most recent racing event in Southampton. Despite the bumpy conditions there was some close racing and I think I captured the flavour of what it was all about.
http://www.youtube.com/watch?v=5iMJz9ZXTf0
Next vid. Richard, an OMRA Member, gives me some insight into what is involved in offshore RC powerboat racing.
http://www.youtube.com/watch?v=pBCvSXUpoXg