Originally Posted by Neal
Why do they do that
Thanks for info BB
The official line was that h/master felt the need for different numbering systems in each channel rather than one unified system. Now main channel numbers from 1 to thirty something, wheras all North Channel buoys number NC1, NC2.. Similarly Wych and East Hook channels all have their own identifiers. Also think that they've done away with some marks as well.
Worth noting that those marks with names as well as numbers have retained the same name, so Diver, Aunty Betty, Hamish etc still exist just with different numbers. Think some positions have changed slightly as well, but only be a few feet to reflect changing underwater topography