Hi Mary,

Fair point, on the surface it doesn't seem as though ISAF does a great deal, especially for grass-roots sailing and catamaran sailing. But among other things ISAF administers the Racing Rules of Sailing which governs almost every competitive sailing event (can't think of one that doesn't but I'm sure they exist) and whether we are an ISAF registerd/recognised/sanctioned/whatever class, we are racing governed by their rules - which include sail measurement and designation to my knowledge.