Islands Elevation: 18m / 59feet

http://elevation.maplogs.com/poi/little_saint_james_island_little_st_james_island_st_thomas_usvi.299127.html

Ledges of Little Saint James depth: 16.1 m (avg), 20 m (max)

http://diveseven.com/dive-site/view/6575/ledges-of-little-saint-james

>>6994445

That's my understanding of it.