Answer :
State law requires divers and snorkelers to display a descending flag to mark the dive site. Boat operators must not operate within 50 feet of a displayed flag and must reduce speed to "idle speed" when within 200 feet of the flag.
Divers and snorkelers should not place a flag in an area occupied by other divers or where their diving activity will cause traffic obstruction. Divers should also follow all water safety regulations themselves.
Boats must be at least 50 feet from the flag. If they must approach the diving site, operators must obtain permission from the person who placed the flag or the vessel displaying the flag.
Beyond 50 feet, boat operators must operate at "idle speed" to a distance of 150 feet. Patrol or rescue duties are not exempt from such requirements, especially in emergencies.
There are two types of flag use to indicate diving activity which is as follows:
Divers Flag: A rectangular red flag (at least 20 x 24 inches when launched) with a white diagonal is used to mark the diving area. This flag must also be placed on ships in the waters of the state.
Alpha Flag: The blue-and-white National Flag A (or Alpha Flag), at least 3.3 feet (one meter) high and visible from all directions, must be displayed on vessels on state or federal waters . This flag indicates that the ship is involved in a dive operation.
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