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Before high altitude diving, the instrument must be set to the Altitude
Adjustment mode to adjust the calculations for the new altitude. The
maximum partial pressures of nitrogen allowed by the mathematical
model of the dive computer are reduced according to the lower ambient
pressure.
As a result, the allowed no-decompression stop limits are considerably
reduced.
SURFACE INTERVALS
The dive computer requires a minimum surface interval of 5 minutes
between dives. If a surface interval is shorter than 5 minutes, the next
dive is treated as a continuation of the previous dive.
6.2. SUUNTO REDUCED GRADIENT BUBBLE
MODEL (RGBM)
The Suunto Reduced Gradient Bubble Model (RGBM) is a modern algo-
rithm for predicting both dissolved and free gas in the tissues and blood
of divers. It was developed in a 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 signifi cant advance on the classical Haldane models, which do not
predict free gas (microbubbles). The advantage of Suunto RGBM is ad-
ditional safety through its ability to adapt to a wide variety of situations.
Suunto RGBM addresses a number of diving circumstances outside the
range of just dissolved gas models by:
• Monitoring continuous multiday diving
• Computing closely spaced repetitive diving
• Reacting to a dive deeper than the previous dive
• Adapting for rapid ascents which produce high micro-bubble
(silent-bubble) build-up
• Incorporating consistency with real physical laws for gas
kinetics.
Suunto RGBM Adaptive decompression
The SUUNTO RGBM algorithm adapts its predictions of both the effects
of micro-bubble build-up and adverse dive profi les in the current dive
series. It will also change these calculations according to the personal
adjustment you select.
The pattern and speed of decompression at the surface is adjusted
according to micro-bubble infl uence.