Rules for RI divers and boaters
According to research done by Tom Holtey of :
For Divers in Rhode Island
18″ x 18″ diver down flag required. Flag must be illuminated at night.
For Boaters in Rhode Island
Other boaters must keep 50′ from flag.
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P.S. The information above was as complete and up-to-date at the time as I could make it. It should not be construed as providing legal advice. You should conduct your own legal research or contact an attorney.