Have a look at www.catamaran.co.uk; it's the main UK 'clearing house' for all catamaran sailing in the UK and as such has links to the UK F18 Assoc site (which I personally do not think is a nice site). Also links to the Holland site which is quite fun. Both have the rules on them somewhere. <br> <br>Regards, <br>Colin <br> <br>www.sailwave.com <br><br><br>