http://webapp.navionics.com

This may be "old hat" to some - this website (may have to play around with it) will show you GPS/plot charter info on various BVI anchor sites "as if you were there in your boat".

I'm using it for a preview of San Juan Island trip next week (that's Northern Washington State near Canada with 55-65 temps and protected charter waters)

Any way > its free and you can look at anchor sites/water depths.