Distances between islands for charter route

For purposes of my business plan, I am trying to calculate distances between certain islands in the USVI and BVI in order to estimate fuel costs for a charter route for a motor yacht/trawler in the size range of about 65'. Does anyone (perhaps Pamela?) know of an online source where I can do this or find pre-determined routes, short of investing in charts and actually mapping it the old fashioned way? Is there anyone on this board who runs charter and can answer that question from a personal experience standpoint?

And by the way . . . if there is anyone on this board who runs charter, I'm all ears to any advice/suggestions on topic in addition to the inquiry set forth above regarding calculating distances. I'll be looking for a licensed captain when I get there because my license will only be for "Inland" at that time until I acquire enough hours to qualify for "near coastal."

Thanks to anyone who can help.

Ang