Alabama Dive Flags
Rules for AL divers and boaters
For Divers in Alabama
According to the Code of Alabama, Section 33-5-22 (e):
A diver's flag must be displayed on the surface of any water where skin divers are operating as may be stipulated by the Department of Conservation and Natural Resources.
According to the Alabama Department of Conservation and Natural Resources's Boating Equipment Checklist:
The diver's flag will be at least 300 mm (12 inches) square, colored red with a white 500 mm (2 inch) stripe running diagonally from the top staff corner to the bottom fly corner.
This Boat-Ed page for Alabama's Legal Requirements of Boating
Other Equipment & Regulations gets specific about how far you can be from your dive flag: 50 feet.
For Boaters in Alabama
According to the Alabama Department of Conservation and Natural Resources's Boating Rules, Regulations, and Enforcement:
Vessels shall keep at least 100 feet clearance of displayed diver's 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.