Just back (6 days ago) from a fantastic week on the CA IV. I'd have to say that the diving on LC and Cayman Brac was fantastic, I was a bit disappointed by the (few) dives we did on GC; less visibility and reefs that seemed a bit "worn" but please keep in mind we only did 6 dives on GC, and the visibility is certainly more an issue of current weather than a sign of the dive site quality. The Crew were clearly psyched the weather forecast was good for our week and as soon as we picked up a delayed passenger made a beeline for Little Cayman. It seemed a number of prior weeks they were limited to Grand Cayman and were clearly ready to get over to Little Cayman. The week prior they made the trip but the Capt. mentioned the crossing was particularly rough, and our last day he mentioned the forecast didn't look as good and seemed to be wondering out loud if they were going to make the crossing.
Our trip over was 3-5' seas, a little rough, and while I don't normally have issues was not at my best with 7 hours of rocking and rolling. All that was forgotten after the 1st dive on Bloody Bay wall, really spectacular wall diving, all everyone says it is. The rest of our trip we were on Bloody Bay wall, with 1 morning trip over to the Brac for 2 dives on the M.V. Capt. Keith Tibbetts.
I commented to a fellow guest that now that I had dived both I would have gladly passed on the GC diving and spent the entire week at LC, though I assume there are better sites on GC we never got a chance to hit. Basing the CA IV out of LC would see to make more sense, though resupplying there may be more challenging and it's easier to get to Grand Cayman. However now that I’ve been there I would have to say that unless the other dive sites on GC were substantially better than what had a chance to do, I would not be satisfied taking the trip and only diving Grand Cayman.