Hello everyone! We have booked our USVI charter from Dec. 19th -29th! We miss the islands and are so excited. Can someone point me to an application that shows if there are mooring balls open OR to reserve. I thought I saw a thread that mentioned this. Thank you!

The mooring ball app is for the BVI: Boaty Ball. To my knowledge there is no app for USVI balls (most are on St. John in the National Park), first come first served. At least that is what we experienced in July.

There is no app or reservations for the NPS moorings or other moorings in the USVI.
This is very useful site for STJ.
https://www.nps.gov/viis/planyourvisit/virgin-islands-marine-visitor-use-information.htm