The last time I was in the USVI's in 2009 most liveaboards who work on St Thomas, anchor-out on the west side of Water
Island - free. Some have installed mooring
bouys-free. If the word gets out that authorities are on the lookout, they scoot around to other anchorages
for a week or so.
There are three or four bays on St John's that have very territorial squatters, but they shall remain nameless.