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  2. Diver down flag - Wikipedia

    en.wikipedia.org/wiki/Diver_down_flag

    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.

  3. Surface marker buoy - Wikipedia

    en.wikipedia.org/wiki/Surface_marker_buoy

    A delayed surface marker buoy (DSMB), decompression buoy, or deco buoy is an inflatable buoy which can be deployed while the diver is submerged and generally only towards the end of the dive. The buoy marks the diver's position underwater so the dive boat crew can locate the diver even though the diver may have drifted some distance from the ...

  4. Glossary of underwater diving terminology: D–G - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_underwater...

    There are two versions: the international code letter flag 'Alpha', , and the red flag with white diagonal bar, . dive ladder diver ladder. See: Human factors in diving equipment design#Diver ladders. A ladder suitable for divers dressed for the specific dive to climb up and down between the surface deployment area and the water. Dive Leader

  5. Diver communications - Wikipedia

    en.wikipedia.org/wiki/Diver_communications

    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]

  6. Glossary of underwater diving terminology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_underwater...

    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 ...

  7. Ascending and descending (diving) - Wikipedia

    en.wikipedia.org/wiki/Ascending_and_descending...

    The diver handling the buoy may choose to remain slightly negative during the ascent to keep a small amount of tension on the line as it is wound onto the reel or spool. This reduces the risk of entanglement of the line, and gives the diver warning when buoyancy is about to become positive by reduction in line tension.

  8. Canoe and kayak diving - Wikipedia

    en.wikipedia.org/wiki/Canoe_and_kayak_diving

    Drift diving – Scuba diving where the diver is intentionally transported by the water flow; Dive boat – Boat used for the support of scuba diving operations; International maritime signal flagsFlag used to communicate something about the ship flying it from a distance; Kayaking – Use of a kayak on water; Scuba diving – Swimming ...

  9. Distance line - Wikipedia

    en.wikipedia.org/wiki/Distance_line

    The length of the distance line used is dependent on the plan for the dive. An open water diver using the distance line only for a surface marker buoy may only need 50 metres (160 feet), whereas a cave diver may use multiple reels of lengths from 25 ft (7.6 m) to 1000+ ft (300 m).

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