I don't know of a map which shows which anchorages still have anchor
space available in the BVI. Quite a bit depends upon draft, a shallow-draft sailboat can still anchor
in Trellis Bay while a deeper keeled one cannot. If the winds are steady you can still anchor
close in shore at the Bight close to the concrete dock, but if there is a chance of being backwinded then that position is a very bad one. With enough chain I anchor
in the middle of the bight, but the water is 50-60 deep there.
One can anchor outside of the mooring ball fields in the North Sound - in good sand at 20 feet in Leverick, off the Sandbox on Prickly Pear in 10-20 feet, off Prickly Pear towards Saba Rock in 10-20 feet all the way along the shore, outside of the mooring field at Saba/BEYC in 40-50 feet.
At Anegada one can anchor off the pier in 7-10 feet in good sand.
Jost has pretty negligible holding at Great Harbour close in, better further out in 30 feet.
Soper's hole is full and I haven't found a place to set anchor there, even further out it is usually quite crowded where I believe there is holding at 20-30 feet.