SUUNTO HELO2 - Manual (Page 102)

10.2. RGBM
The Suunto Reduced Gradient Bubble Model (RGBM) is a modern algorithm for pre-
dicting both dissolved and free gas in the tissues and blood of divers. It was developed
in co-operation between Suunto and Bruce R. Wienke BSc, MSc, PhD. It is based on
both laboratory experiments and diving data, including data from DAN.
It is a significant advance on the classical Haldane models, which do not predict free
gas (microbubbles). The advantage of Suunto RGBM is additional safety through its
ability to adapt to a wide variety of situations. Suunto RGBM addresses a number of
diving circumstances outside the range of dissolved-gas-only models by:
•
Monitoring continuous multiday diving
• Computing closely spaced repetitive diving
• Reacting to a dive deeper than the previous dive
• Adapting to rapid ascents which produce high microbubble (silent-bubble) build-
up
• Incorporating consistency with real physical laws for gas kinetics
10.2.1. Suunto Technical RGBM decompression model
Suunto's decompression model development originates from the 1980s when Suunto
implemented Bühlmann's model based on M-values in Suunto SME. Since then re-
search and development has been ongoing with the help of external and internal ex-
perts. In the late 1990s Suunto implemented Dr. Bruce Wienke's RGBM bubble model
to work with the M model. The first commercial products with the feature were Vyper
and Stinger. With these products the improvement of diver safety was significant.
Now Suunto has taken another leap in decompression modeling by introducing Suunto
Technical RGBM decompression model with He tissues.
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