fishballer
Contributor
is it like a safety stop countdown on the nemo? i have no idea how/when it triggers. skimming the manual doesn't help either.
any help?
any help?
rgbm deep stop
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Charlie99
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Is your question in reference to a specific dive computer? If so, it would help to specify which one.
Many "RGBM" dive computers don't actually run the RGBM algorithm, but instead use a dissolved gas model (aka Haldanian, neo-Haldanian, or Buhlmann) with variable limits and with deep stops added by an ad hoc algorithm.
Many "RGBM" dive computers don't actually run the RGBM algorithm, but instead use a dissolved gas model (aka Haldanian, neo-Haldanian, or Buhlmann) with variable limits and with deep stops added by an ad hoc algorithm.
OP
fishballer
Contributor
the specific computer i'm using is Mares Nemo.
http://www.rgbm.mares.com/html/ENG/rgbm/deepstop.asp?id=7&lang=ENG
i understand the benefits of the deep stop, and that Mares RGBM uses it. However, i have yet to see it on the nemo. just wondering if the nemo actually has any deep stop functionalities.
http://www.rgbm.mares.com/html/ENG/rgbm/deepstop.asp?id=7&lang=ENG
i understand the benefits of the deep stop, and that Mares RGBM uses it. However, i have yet to see it on the nemo. just wondering if the nemo actually has any deep stop functionalities.
Charlie99
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The Nemo is NOT a full up RGBM computer. By this I mean that it is a basic multicompartment dissolved gas model (neo-Haldanian) with a few tweaks. To emulate RGBM, the dissolved gas compartment limits (M-values) are reduced in response to bad dive profiles such as sawtooth dives, fast ascents, reverse profiles, and also reduced in response to doing a repetitive dive and doing dives over multiple days.
The Nemo is NOT a dual phase or bubble model in that it tracks only dissolved gas and does not attempt to estimate free phase (i.e. bubble) volume, as is done in a true dual phase model such as VPM or the full up RGBM model.
In this it is very similar to the "Suunto RGBM" model.
It does appear that the Mares-Wienke RGBM model has both a safety stop and some form of deep stops added in some ad hoc manner. The manual and the Mares website are very vague about how the deep stops are implemented, but reading between the lines, it appears that the computer calls for deep stops whenever any of the dissoved gas compartments go above a certain level. As a dissolved gas model, the Nemo most likely gives no more nor any less credit to deep stops than do any of the many dissolved gas computers on the market. OTOH, the NEMO may very likely further reduce the dissolved gas model limits if you skip the deep stop, in the same way that it will reduce model limits if you have fast ascents, repetitive dives, multi-day dives, etc.
Your best bet on figuring out what triggers them is to periodically press the <ESC> button on the computer during a square profile dive. That will cause the current deep stop, if any, to be displayed. After noting what the deep stops it generates, you may be able to figure out what triggers them. The depth will probably be something like 1/2 max depth or 1/3 max depth and they will probably be triggered anytime you take a compartment past some specific point, such as 60 or 80% of M-value.
Even more obtuse and undocumented is how much the M-values will be reduced according to the profiles of previous dives.
Charlie Allen
The Nemo is NOT a dual phase or bubble model in that it tracks only dissolved gas and does not attempt to estimate free phase (i.e. bubble) volume, as is done in a true dual phase model such as VPM or the full up RGBM model.
In this it is very similar to the "Suunto RGBM" model.
It does appear that the Mares-Wienke RGBM model has both a safety stop and some form of deep stops added in some ad hoc manner. The manual and the Mares website are very vague about how the deep stops are implemented, but reading between the lines, it appears that the computer calls for deep stops whenever any of the dissoved gas compartments go above a certain level. As a dissolved gas model, the Nemo most likely gives no more nor any less credit to deep stops than do any of the many dissolved gas computers on the market. OTOH, the NEMO may very likely further reduce the dissolved gas model limits if you skip the deep stop, in the same way that it will reduce model limits if you have fast ascents, repetitive dives, multi-day dives, etc.
Your best bet on figuring out what triggers them is to periodically press the <ESC> button on the computer during a square profile dive. That will cause the current deep stop, if any, to be displayed. After noting what the deep stops it generates, you may be able to figure out what triggers them. The depth will probably be something like 1/2 max depth or 1/3 max depth and they will probably be triggered anytime you take a compartment past some specific point, such as 60 or 80% of M-value.
Even more obtuse and undocumented is how much the M-values will be reduced according to the profiles of previous dives.
Charlie Allen
Nemo Manual:
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