Persons scuba diving, skin diving and snorkeling must display a “diver down” flag to mark their diving area. Between sunset and sunrise, the flag must be lighted. Vessels not engaged in diving operations must remain at least 150 feet from a displayed “diver down” flag. The “diver down” flags are:
Scuba divers and snorkelers should not place a flag in an area already occupied by other boaters or where their diving operation will impede the normal flow of waterway traffic.