Dive Flag — What It Is and Why It Matters
A dive flag is a surface marker that warns boat traffic of divers below. Two styles are in common use: the red flag with a white diagonal stripe (the "diver down" flag, primarily used in North America) and the blue-and-white Alpha flag (international maritime signal flag A, meaning "I have a diver down; keep well clear at slow speed"). Many jurisdictions legally require displaying a dive flag when diving.
Dive flags are typically flown from a float towed by the dive group, from the dive boat, or on a buoy anchored at the dive site. Boaters are generally required to stay 50 to 100 meters (150 to 300 feet) away from a displayed dive flag, though enforcement and compliance vary by location.
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Frequently Asked Questions
Which dive flag should I use?
In North America, the red-and-white diver down flag is the standard and is legally recognized. Internationally, the Alpha flag is the correct maritime signal. Many divers and boats display both. Check your local regulations — some areas legally mandate a specific flag.
Is a dive flag legally required?
In many U.S. states, yes — Florida, California, and others have specific laws requiring a dive flag within a certain distance of divers. International regulations vary by country. Even where not legally required, displaying a flag is a critical safety practice that protects you from boat strikes.
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