It's my understanding some of the NC divers are pretty deep (never been there; did a little online checking since I'd like the see the sand tiger sharks around a wreck in that region someday). Ergo, once you finish OW, and while building up your experience, you might want to take Advanced OW &/or Deep Diver to cultivate a comfort level for greater depths, initially under an Instructor's supervision.
Oh, and one thing about boat dive op.s that seems to vary by region (such as Caribbean touristy sites vs. some coastal California ops, from what I read in another thread) is whether they put a Dive Master in the water to lead the main group around on a guided dive, or just drive the boat out, give a dive briefing, and expect you to jump in, do your own dive, find your way back to the boat within an hour or so, etc...
There's a big difference between 'follow the leader' (which I like) and independent dive navigation (which many people on the forum seem to admire, but would likely see me the object of a Coast Guard search & rescue mission!).
Richard.