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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 ...
A delayed or deployable surface marker buoy (DSMB), also known a decompression buoy, is a soft inflatable tube that is attached to a reel or spool line at one end, and is inflated by the diver under water and released to float to the surface, running out the line as it ascends. This provides information to the surface that the diver is about to ...
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 ...
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A surface marker buoy (SMB) with a reel and line is often used by a dive leader to allow the boat to monitor progress of the dive group. This can provide the operator with a positive control of depth, by remaining slightly negative and using the buoyancy of the float to support this slight over-weighting.
The diver may tow a surface marker buoy to show their position to the support team if conditions allow. The diver unreels a section of distance line appropriate to the visibility and marks the start position by a peg, loose marker, compass heading, or a pre-laid marker line extending outwards from the datum position.