Rgbm - Suunto D4 User Manual

The quality of the battery. (Some lithium batteries may exhaust unexpectedly,
•
which cannot be tested in advance)
The time the dive computer has been stored until it gets to the customer. (The
•
battery is installed in the unit at the factory)
NOTE

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
•
86
Low temperature or an internal oxidation of the battery may activ-
ate the battery warning even though the battery has enough ca-
pacity. In this case, the warning usually disappears when the
DIVE mode is activated again.