Chris - I bought one of the CMOS type off e-bay last year and mounted it on a servo on the bow of a police boat. I then took the boat out to the middle of the pond, dropped anchor and tried to film the other models as they came past. The pictures were relayed back to the receiver and recorded on my mate's portable DVD recorder. Pictures were acceptable but the main problem was making sure the camera was kept pointing at the subject. Not as easy as it sounds. Lots of pool pics with no boats! Good pics of the onlookers pondside though. I'll never make a cameraman. And unlike Mankster I haven't yet dared to try and waterproof it to try on my Trafalgar!
Andrew