• Delayed Surface Marker Buoy (DSMB)

Delayed Surface Marker Buoy (DSMB)

Boats and currents are two common factors associated with many dive sites. Boaters don't always recognize that divers are in the area and current can carry you further than expected. Launching a delayed surface marker buoy (DSMB) before you surface can alert others to your location in advance of your ascent.


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You can use the DSMB line to complete your safety stop, which is advantageous in a current or when there are no other visual references. Many vacation destinations require you to have a DSMB adding another layer of safety for yourself as well as others! Take this course to learn about all the beneficial uses of a DSMB.

You need to be an Open Water Diver who is at least 12 years old to enroll in the DSMB Diver course.

Marker buoys serve a range of purposes and you'll learn about common types of DSMB along with the reels used to control them. During the two training dives, you'll practice:

  • Preparing and stowing your DSMB and reel.
  • Deploying the DSMB from a stationary position and from mid-water.
  • Swimming while towing a DSMB and managing the reel and line.
  • Making a safety stop using the DSMB line.

What’s Included in this course?

  • Open water dive with an instructor



You will need a reel with a line and a DSMB along with the rest of your basic scuba equipment. Your Instructor may suggest other gear appropriate for local diving.



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