I've used iNavX on previous BVI trips (and lake sailing). Just started testing out the Garmin BlueChart app on the iPad and iPhone. It's definitely more intuitive to set up and purchase/install charts. I also find it nice (or at least entertaining) that ActiveCaptain feeds right into it. Basic GRIB seems to come with it but you upgrade to more advanced services. Purchasing charts is done directly through the software and the Apple App Store. Much easier than using X-Traverse. Again, haven't used it on the water yet, but it's pretty easy to pick up.

Here is a promo video for it...

Garmin BlueChart Video

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