Agrimsrud - I hadn't seen the chart produced by ONB (which somebody posted on this thread) at the time we were there. So I couldn't say 100% that all the markers were on station. But certainly the channel from North Sound, between Saba and BEYC all the way up to the Beach Club main arrival dock was very well marked.

Whilst we were there we saw several large (c. 50ft) cats make the same journey to drop people off. They seemed to have no issues.