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A diver getting ready to dive in front of an alpha flag. As a code signal the International maritime signal flag Alpha (or "Alfa", signifying the letter "A") has the meaning of "I have a diver down; keep well clear at slow speed", [1] used to indicate that the vessel has limited maneuverability, and the presence of a diver in the water around the boat.
Letter flags and ICS meanings Letter / radio name Flag Blazon ICS meaning as single flag Meaning when used with numeric complements A Alfa: Swallowtailed, per pale argent and azure "I have a diver down; keep well clear at slow speed." Azimuth or bearing B Bravo: Swallowtailed, gules "I am taking in or discharging or carrying dangerous goods."
Flag Meaning As single flag With numeric complements A Alfa [ˈal.fa] "I have a diver down; keep well clear at slow speed." Azimuth or bearing B Bravo [ˈbrɑː.voʊ] "I am taking in or discharging or carrying dangerous goods." (Originally used by the Royal Navy specifically for military explosives.) C Charlie [ˈtʃɑː.li] "Affirmative." [a] [b]
A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag "alpha", which has a white hoist and blue swallowtail fly, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed. [56]
The Rescue Diver course is the third level qualification in the American international system, [clarification needed] following the Advanced Open Water Diver qualification (AOWD). Historically the course was treated as a separate "speciality" rather than a mainstream certification in itself (and arguably it still is in many organization's ...
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The CMAS Self-Rescue Diver training includes the use of a ratchet dive reel to control ascent rate in the event of unplanned positive buoyancy at depth due to loss of weights. The end of the line is fastened to a heavy object on the bottom, and deployed under tension to control depth.
This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in other contexts. Underwater diving can be described as a human activity – intentional, purposive, conscious and subjectively meaningful sequence of ...