Slamfire
Contributor
About ten years ago JJ posted this in TDS (emphasis is mine):
The reason why I am asking is because I have been doing some deco dives with a UTD trained friend. His training is basically limited to ratio deco. Before any dive we have comprehensive discussions about the profile. Typically we end up following ratio deco because VPM will usually clear me by the time we finish the ratio deco plan.
Occasionally, though, his ratio deco profile will not clear VPM-B on +2 conservatism. In paper, both profiles will have pretty much the same overall runtime, but ratio deco calls for deeper stops than VPM and these end up adding time to the shallower stops. The shape of the curve is slightly different. In those cases we end up padding the shallow stops until it clears vpm.
In our discussion, the question of GUE procedures has risen. Neither of us is entirely sure if GUE procedures would call for stops that start as deep as UTD ratio deco procedures. I tell him that I know GUE has DecoPlanner and that it uses VPM or GF. And I also think that RD for GUE is reserved only for contingencies. If they use VPM or GF that means they are probably not starting the stops as deeply as UTD ratio deco does. I told him I would ask around here.
So what is DIR refined decompression? Is it that you use DecoPlanner to cut some tables in VPM-B or Buhlmann GF and have ratio deco for contingencies? If so, do you just write the tables on your wetnotes and pull them out when you start your ascent? Is there any recommendation favoring either VPM over GF or vice-versa?DIR proposes a degree of detail never before outlined or structured including but not limited to the following: team operations, balanced rig, standard gasses, defined configuration, refined decompression, sensible and standardized nitrogen and oxygen limits, structured helium break gasses, helium deco gasses together with carefully structured procedures for exploration protocol, bail out gasses, rebreather diving, multiple scooter use, multiple (ie more than two) stage bottle management, bottle marking, gas switches (location and methodology), gas sharing, emergency responses and much more.
The reason why I am asking is because I have been doing some deco dives with a UTD trained friend. His training is basically limited to ratio deco. Before any dive we have comprehensive discussions about the profile. Typically we end up following ratio deco because VPM will usually clear me by the time we finish the ratio deco plan.
Occasionally, though, his ratio deco profile will not clear VPM-B on +2 conservatism. In paper, both profiles will have pretty much the same overall runtime, but ratio deco calls for deeper stops than VPM and these end up adding time to the shallower stops. The shape of the curve is slightly different. In those cases we end up padding the shallow stops until it clears vpm.
In our discussion, the question of GUE procedures has risen. Neither of us is entirely sure if GUE procedures would call for stops that start as deep as UTD ratio deco procedures. I tell him that I know GUE has DecoPlanner and that it uses VPM or GF. And I also think that RD for GUE is reserved only for contingencies. If they use VPM or GF that means they are probably not starting the stops as deeply as UTD ratio deco does. I told him I would ask around here.