Just for my own interest, does anyone know where I can find the definition of "The Zone". I have looked on the net but haven't come across an actual definition. I know it's 4 boat lengths in model yachting, but is it to the centre of the mark, or 4 boat lengths from the radius of the mark? In full size racing the size of the mark is small compared to the length of a boat, but in our world, especially sailing the smaller boats and using full size buoys, the difference could be significant. I would appreciate someone pointing me in the right direction! Cheers Steve