Thanks for the clarification gents, I understand the process just never thought it was available for me as a cat1. Good to know, although the fact it's done against SSS would make it a hard grind - the CSS normally goes up at least one even in the calmest conditions, and if there is any wind it can often be 2 or 3 above SSS which makes a big difference. Might still give it a a go though if I've got enough practice in!