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[[Image:Bouee_plongee.png|thumb|left|[[Surface Marker Buoy]]]]
[[Image:ICS Diver.svg|thumb|right|120px|
[[Image:ICS_Alpha.svg|thumb|right|120px|[[International maritime signal flags|Signal flag]] A - "I have a diver down - Keep clear"]]
A '''diver down flag''', or '''scuba flag''', is a [[flag]] used
== Purpose ==
It is used to notify to any [[boat|boats]] to steer clear for the safety of the [[diver]].
The use of this flag is required by law or regulation almost everywhere in the world.
Usually the regulations require divers to display the flag and to stay within a specified distance of it when they are near the surface. As well there is often a larger zone around the flag where no boats are allowed to pass. Several states also prohibit the display of this flag when there is no diver in water.
== Signal flag A ==
The international [[International maritime signal flags|Signal flag]] A (letter ALFA) is used as well to communicate the presence of a [[diver]] in water, but the meaning and the purpose are slightly different: it means that diving operations are restricting the ability of the ship to maneuver. As recent U.S. Coast Guard Notices to Mariners emphasize: <blockquote>The ALFA flag is a navigational signal intended to protect the vessel from collision<ref>http://mysite.verizon.net/vzeohzt4/Seaflags/signals/warning.html</ref>.</blockquote>
== Notes ==
{{Reflist}}
[[Category:Diving_equipment]]
[[de:Taucherflagge]]
[[fr:Pavillon de plongée]]
[[it:Bandiera segnasub]]
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