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  2. 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 ...

  3. Diver navigation - Wikipedia

    en.wikipedia.org/wiki/Diver_navigation

    Distance lines are wound on to a spool or a reel. [9] 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 / 165 feet, whereas a cave diver may use multiple reels of lengths from 50 ft (15 m) to 1000+ ft (300 m).

  4. Drift diving - Wikipedia

    en.wikipedia.org/wiki/Drift_diving

    Surface marker buoy to track a group of divers. Drift diving is a type of scuba diving where a diver is transported by water movement caused by the tide, [1] an ocean current or in a river. The choice whether to drift dive depends on the purpose of the dive and whether there is an option.

  5. Diving equipment - Wikipedia

    en.wikipedia.org/wiki/Diving_equipment

    Diving reel, dive spool or line holder to store and transport a distance line or line for a surface marker buoy. A dive spool, or line spool, is a short cylindrical tube with a large flange at each end, around which a length of line can be wound, and a line holder is a flat H-shaped frame or piece of rigid sheet material on which a length of ...

  6. Ascending and descending (diving) - Wikipedia

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

    A commonly used procedure for ascent in open water when not ascending along a shot line or anchor cable is to use the more recently developed delayed surface marker buoy, or decompression buoy, inflated and deployed at the start of the ascent to notify any vessel in the vicinity of presence and location of the divers as well as helping to ...

  7. Diver communications - Wikipedia

    en.wikipedia.org/wiki/Diver_communications

    A scuba diver who deploys a Delayed Surface Marker Buoy (DSMB) at the end of a dive may use a pre-arranged colour code to indicate to the surface support crew if there is a problem for which assistance is required. In some circles a yellow DSMB is considered an emergency signal, and red means OK.