Thanks for the story oldCGQM and welcome to TTOL! The reef is very clearly marked, but we still cats and power boats inside the Johnson Reef markers pretty routinely. In early November we saw a small private power boat crossing the reef at speed in calm conditions. We stay outside and avoide the inside passage unless we are going to (rarely) Trunk Bay.

Cheers, RickG

S/V Echoes, 2003 Beneteau 423
Grenada