V-Planner VPM & VPM-B dive decompression software

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The VPM model is the most widely used bubble model by tech divers today.

Calculates all types of Nitrox, Trimix, TriOx, HeliOx, OC, SCR, CCR, RB80, KISS and multilevel dives.

Makes plans for Lost deco gas, Turn pressures, Range plans, RB bail outs, watches and warnings. Includes Gas Mixer, Turn pressure formula, Layouts for saving complex dive plans, Graphs, data export, etc.

Customize your deep and extended stops, control stop times, airbreaks.

Recommended by IANTD and used in all their latest training courses.

Approved for commercial diving by various regulatory authorities.

Windows / Linux

    V-Planner is a decompression program that uses the Varying Permeability Model (VPM-B) for decompression profiles. VPM-B is the latest decompression model that is well suited to today's technical diving. The deco profiles will start deeper than traditional models, accounting for micro bubbles, giving a better decompression.

    Bubble models are quickly becoming the way of the future for technical and deep diving. At their core, bubble models use math to simulate and measure micro bubble growth, and set limits accordingly. The output of a bubble model is remarkably similar to many established deep practices such as Pyle Stops, Pearl divers, Florida cave practices and others. At the recent Deep Stops Workshop, presentations from Comex and USN researchers among others, showed that the bubble model style profile is the preferred approach to decompression.

    In VPM, ascent ceilings are determined on allowable gradients for bubble formation rather than M-values. These super saturation gradients are determined by tracking sets of VPM nuclei (bubble seeds) of a certain initial critical radius. These are the microscopic physical structures that stabilize free phase gas and that can grow into full fledged bubbles when the super saturation gradient is sufficient to probe the laplace condition for bubble formation.

    The Varying Permeability Model was originally developed by Yount and Hoffman in 1986. It was further developed by David Yount, Eric Maiken, and Erik Baker from 1999 to 2001. In 2002, after considerable diver feed back, the model was further developed by Erik Baker, to the current VPM-B model. The V-Planner program was developed by Ross Hemingway, and presents the VPM-B algorithm inside a complete and useful Windows dive decompression program. See also... Varying Permeability Model (VPM) References

    Please note - this program is made with the experienced and technical diver in mind. If you're relatively new to diving, you may find this program difficult to use. You're expected to know the theory behind the diving practices and procedures used here.

********* WARNING / DISCLAIMER *********   The author and HHS Software Corp do not warrant that this program accurately reflects the Varying Permeability Model algorithms, or that it won't get you bent or dead, or that it will produce safe, reliable results. This dive schedule is experimental and you use it at your own risk. Diving in general is fraught with risk, and decompression diving adds significantly more risk. Deep diving utilizing multiple gasses, including helium, or rebreathers is about as risky as it gets. V-Planner and the decompression schedules it produces are tools for experienced mixed-gas decompression divers ONLY. If you have not been properly trained in mixed-gas decompression diving by an internationally recognized technical certification agency and/or don't have a firm handle on decompression planning and mixed-gas diving, then DO NOT USE THIS SOFTWARE.