Are you chartering, or taking your own boat? If you're chartering, the charter company will have the right chips for your use. If you're taking your own boat -- sorry, I can't remember what we did (we have a Raymarine plotter). You might want to check the Active Captain website. Regardless of the chip, you'll be well-served by having the paper Explorer chart books -- they are worth their weight in gold because they contain lots of additional information.

I've got a Caribbean Soul I can barely control... (JB)