Ships Station License FCC.
You are required to have a Ships Station License for any vessel that takes more than 6 passengers commercially in the United States Virgin Islands.
You must also have a Ships Station License FCC if you are taking any International Voyage. Yes, between the British and US Virgin Islands in an International Voyage.
This also is needed if you want a National Parks Commercial Authorization Use Certificate.
This is a ten-year license that Nautical Consulting can obtain for you.
To read more on Ships Station License FCC and what is required here is a link to the FCC