What a load of crap..... they do not all use only chain.
....and you are not permitted to drop anchor on coral! DUH!

Try to find a boat in the islands that doesn't use an all chain rode for the
primary. As far as dropping on coral goes your anchor may be in the sand but
your 100' rode may be in the coral. Your only "not permitted" in the "park"
areas. Patches of coral are everywhere.
S/V Express 30 "Ringmaster"
"Trains are a winter sport"