"RGBM" bei Tauchcomputern ist im Normalfall ein Marketing-Gag. Hierzug mal ein paar Auszüge aus der V-Planner Yahoo-Group über RGBM in Suunto-Computern. Ich geh davon aus, dass es bei Mares ähnlich aussieht. Besonders interessant finde ich die Aussage von Ross Hemingway (Entwickler V-Planner): "The recreational wrist computers are at the shallow end of the
pool. The results they show have no worth to a deeper dive and dives with a serious deco requirements."
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On 22/05/2004, at 12:52 AM, Donald Macfarlane wrote:
> Having just bought a suunto computer can someone clarify this for me
>
> Suunto & Gap use the RGBM algorithm
Hi Donald
I think Ross has pretty much covered your questions other than to say
that Bruce Wienke (the RGBM developer) has been hired in the past by
dive computer companies(such as Suunto) to tweak their algorithms.
Bruce has subsequently licensed that work and called it "RGBM" but it
is not RGBM as it relates to a pure bubble model that is comparable to
VPM. This is not really a slam on Bruce, the work in question was done
a long time ago, largely before the current popularity of diving bubble
models in the recreational trimix arena.
If I recall correctly his work on the Suunto largely related to
repetitive recreational air diving dive bubble reduction but still
leaves the Suunto algorithm almost a pure dissolved gas model. If you
read the literature included with your Suunto you will see it is
largely Workman`s neo-Haldanian algorithm with some extra conservatism
designed in by Bruce but no real bubble model `stuff`. Workman was an
avowed anti-bubble model guy. If you plan a dive to say 50m for 30min
on the Suunto (plan it. don`t dive it

you will see it is happy to
yank you all the way up to about 12m (for a minute or two) then pretty
quickly up to 6&3m for your long stops.
So in summary the "RGBM" in the Suunto wrist computers is largely
marketing. Fair enough at the time perhaps, but they really should drop
it now that bubble models such as VPM and Bruce`s real RGBM (Which
Wienke calls "Full Up RGBM") and are so prevalent. It is confusing
people (as your post indicates) and it happens quite a lot. Which is
exactly what the marketing guys at Suunto already know ... and why it
won`t be disappearing off the Suunto boxes any time soon
Regards
Dean Laffan
Real World Productions
67 Little George St, Fitzroy
Victoria, Australia
+613-9419-3966
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Subject: Re: [vplanner] RGBM Interpretation
Date: Freitag, 21. Mai 2004 23:55
From: Ross Hemingway <rossh@pinc.com>
To: vplanner@yahoogroups.com
Donald Macfarlane wrote:
>Having just bought a suunto computer can someone clarify this for me
>
>Suunto & Gap use the RGBM algorithm
Hello Donald,
Gap uses real RGBM, and the HydroSpace Explorer uses real RGBM. The
Suunto and all those other recreational wrist computers are labeled
RGBM, but do not use real RGBM. Each manufacturer is free to redesign
the RGBM to fit their own needs. Your Suunto output will not match the
real model. The recreational wrist computers use the name, but not the
model.
>VPM and RGBM algorithms have the same basic origins
Hmm... well the jury is still out on that one.
Very brief history: The work on Varying Permeability started in the
70`s with research by Prof. Yount and Hoffman and others at the U of
Hawaii. By 86 they had formalized the VPM. In the early 90`s Erik
Maiken started using this model in his diving, and made available a
program that computed dives. By the end of the 90`s Many had become
involved in the development and application of VPM to diving. Erik
Baker`s Fortran dive program become the standard. V-Planner was
released in mid 2001 using the Baker implementation, and model usage
becomes wide spread. Erik Baker then works on a revision to the model`s
implementation. In Jan 2003 VPM-B is released.
>Does the Suunto interpretation include the subsequent developments that lead
> to the development VPM-B
No. The recreational wrist computers are at the shallow end of the
pool. The results they show have no worth to a deeper dive and dives
with a serious deco requirements.
>If not have Suunto include a mechanism to extend the shallow stops, or is
> only really necessary for deeper & longer dives
For tech dives with deco time, you will switch your Suunto it into gage
mode and use it as a depth meter only, or leave it behind. No one will
endorse the use of any recreational dive computer as planning tool for
deep/tech deco dives.
Regards
--
Ross Hemingway
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Subject: Re: [vplanner] RGBM Interpretation
Date: Freitag, 28. Mai 2004 01:42
From: bullshark@scubadiving.com
To: vplanner@yahoogroups.com
> Having just bought a suunto computer can someone clarify this for me
>
> Suunto & Gap use the RGBM algorithm
GAP is true RGBM.
Suunto is !!!NOT!!! RGBM.
Suunto specifically calls it "Suunto RGBM".
Suunto RGBM is Spencer(neo-haldane) algorithm with RGBM advisement via
lookup tables. Wienke has called it "RGBM-folded Spencer".
In essence, this is no different from what Uwatec has done for a decade.
i.e. Use a table look up for predictors of microbubble status/hazards.
Uwatec u-bubble tables are developed from field doppler studies as opposed
to the Suunto u-bubble tables which are theoretical.
No wrist computer on the market that I know of has the computational
horspower to run rgbm or vpm in real time.