This may be late, but I bought the Virgin Island Chartkit years ago and also the Imray-Iolare chart. The Imray Iolare chart is waterproof and can be folded. I take this chart with me every time and leave the Chartkit home. Your navigation will be visual, but you may still want to bring a GPS if one isn't aboard.
The Imray-Iolare chart requires a slight correction if you are taking waypoints off it for your (undoubtedly WGS-84 datum) GPS. The chart tells you what the correction should be.
BTW, we took our 8 and 12 yr old grandkids to the USVI and BVIs last year. It was their first time and they really enjoyed it. They got into the pirate scene, snorkeling, hiking (like on Norman Island), the caves, and especially The Baths. You might plot your course on the chart--ball point works--and give it to them as a souvenir, in case your charter company doesn't provide a plain paper chart to keep for this purpose.