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NOTE
10.2. Suunto 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
•
Low temperature or an internal oxidation of the battery may
activate the battery warning even though the battery has
enough capacity. In this case, the warning usually disappears
when the DIVE mode is activated again.
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