Dive Flag
Definition
A dive flag is a warning signal displayed at the surface to indicate that divers are underwater in the vicinity.
More on Dive Flag
Dive flags are used to alert boats and other watercraft to the presence of divers below. They help prevent collisions and protect divers during ascent or while surfacing. There are two main types: the red flag with a white diagonal stripe (used primarily in North America), and the blue-and-white Alpha flag (international maritime signal). Dive flags are mounted on floats, buoys, or boats and are often required by law in many jurisdictions when diving from shore or small vessels.
Frequently Asked Questions
A dive flag signals that divers are underwater nearby. Boats should stay well clear—typically at least 100 to 200 feet depending on local laws.
The red-and-white Diver Down flag is common in the U.S., while the blue-and-white Alpha flag is used internationally for vessels with divers down.
Yes, in many places. Regulations vary, but most coastal states and countries require dive flags when divers are not tethered to a large boat.
Typically within 50 to 100 feet. Divers who stray farther risk not being seen by boaters or losing access to their float.
Yes, divers often tow surface marker floats or flags on reels, especially when shore diving or exploring large areas.