MV-Plan uses the Buhlmann ZHL-16B and ZHL-16C decompression models with m-value gradient factors for extra conservatism.
Gradient factors are a mechanism to introduce conservatism on top of the Buhlmann model. Essentially they represent a percentage of allowable over pressurisation of the theoretical tissue compartment(s). So a GF of 100% means standard Buhlmann, a GF of 0% means that no compartment is allowed to go above ambient pressure (not very practical). The methodology proposed by Eric Baker proposes a starting gradient factor to be applied to the first deco stop, and an ending gradient factor to be applied to the final stop, with a sliding scale in between. Typical values are 30-80, meaning the first stop is 30% of maximum overpressure, the last stop is 80% overpressure, thus implementing an initial "deep stop" and a measure of conservatism for the last stop. MV-Plan accepts GF values from 10% to 100%. A GF of 100% is raw Buhlmann, with no margin at all: Buhlmann never intended divers to use 100% of his maximum over pressure, as it represents the point where 5% of divers get the bends. Keeping whatever margin you judge necessary is up to you. Further information can be found here
MV-Plan is limited to:
These limits are imposed because of basic common sense - i.e. the validity of the model is questionable beyond this range. If this presents a problem to you and you wish to experiment with plans outside of this range please email me.
MV-Plan supports 6 languages: English, French, German, Spanish, Italian and Polish. If you would like to help add your language please contact us.
Yes. MV-Plan 2.0 fully supports CCR diving with configurable setpoints (fixed or dynamic), multiple diluents, loop flushes during the ascent, a dive finished on 100% oxygen, and complete bailout planning with stress gas consumption calculations.
Yes. A repetitive dive starts from the real tissue state the previous one left, after the surface interval you enter, with cumulated CNS and OTU. The Day screen chains a whole series, shows the totals and exports them; a day can be saved and reloaded with the settings that produced it.
Yes. The ascent is checked against the Subsurface engine on 50 reference profiles, from plain air to deep rebreather trimix, with a mean gap of 0.33 min. That comparison is replayed on every change to the engine, alongside more than 300 non-regression scenarios.
MV-Plan 2.0 is available on:
No. MV-Plan does not collect any personal data, does not require an account, and does not include ads. All dive plans are stored locally on your device.
MV-Plan was written as a personal project so that I could experiment with m-value gradient factors. A commercial version of MV-Plan implies a level of support and warranty that I am not able to give. Hence the best solution is to make MV-Plan available free to the diving community.
Yes. The source code for MV-Plan is available under the AGPL-3.0 license. You are encouraged to look at the source code and re-use it for your own projects. If you are interested in contributing to the on-going development of MV-Plan then please contact us.