Deploying a Delayed Surface Marker Buoy (DSMB) is a crucial skill for scuba divers, often overlooked during initial training. While most training covers the use of Surface Marker Buoys (SMBs) at the surface, deploying a DSMB from depth using a reel or spool is a different challenge. In this blog post, we'll dive into the nuances of DSMB deployment, ensuring you're prepared for this vital aspect of scuba diving.
What is a DSMB and Why is it Important?
A DSMB, compared to a standard SMB, offers the advantage of being deployed from underwater. This is particularly useful in marking your location while still at depth. It's a skill that requires practice and understanding, as improper deployment can lead to entanglement or rapid ascent.
Choosing the Right DSMB
When selecting a DSMB, consider features like a self-sealing bottom, an overpressure valve to release expanding air, and options for inflation (oral, low-pressure inflator, or from a second stage). I personally use a 4ft long DSMB with multiple inflation options, a self-sealing bottom, and a bright color for visibility.
The Need for a DSMB
In many regions, divers are required to carry a DSMB as a safety precaution. It's especially crucial during drift diving or in strong currents. A DSMB can also serve as an ascent line or a signal for underwater problems.
Preparing for Deployment
To deploy a DSMB, you'll need the buoy, a properly prepped spool, and a double-ender. It's best to practice in a controlled environment, like a body of water 10-20 ft deep.
Deployment Steps
- Achieve Neutral Buoyancy: Before deployment, ensure you're neutrally buoyant.
- Prepare the DSMB and Spool: Unclip the DSMB and spool from your gear, ensuring the spool's line is free to unravel.
- Attach the DSMB to the Spool: Use a girth hitch to attach the spool to the DSMB.
- Inflate the DSMB: Choose your preferred method of inflation (oral, low-pressure inflator, or second stage). Be cautious not to overinflate.
- Release and Control: Once inflated, release the DSMB, allowing it to ascend while you control the spool.
Safety Tips
- Controlled Inflation: Avoid overinflation to prevent rapid ascent.
- Maintain Buoyancy: Adjust your buoyancy as needed during deployment.
- Awareness: Be mindful of your surroundings to avoid entanglement.
Conclusion
Mastering DSMB deployment is a skill that enhances your safety and proficiency as a diver. With practice and attention to detail, you can confidently deploy a DSMB in various diving situations. Remember, this guide is a starting point, and hands-on training is invaluable.
For more detailed instructions and tips, watch my full video tutorial here. Stay safe and enjoy your diving adventures!
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