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VERSION 1.0 VERSION 1.0
VERSION 1.0 VERSION 1.0
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Nautilus Dive PlannerNautilus Dive Planner
Nautilus Dive PlannerNautilus Dive Planner
Nautilus Dive Planner
Decompression ModelsDecompression Models
Decompression ModelsDecompression Models
Decompression Models
3.1 NAUTILUS DIVE PLANNER DECOMPRESSON3.1 NAUTILUS DIVE PLANNER DECOMPRESSON
3.1 NAUTILUS DIVE PLANNER DECOMPRESSON3.1 NAUTILUS DIVE PLANNER DECOMPRESSON
3.1 NAUTILUS DIVE PLANNER DECOMPRESSON
MODELSMODELS
MODELSMODELS
MODELS
The Nautilus Dive Planner provides an interface into the
following decompression algorithms:
Parallel models:
Hamilton-Kenyon 11 Compartment Parallel (TII-11F6)
Buhlmann 16 Compartment Parallel (ZHL-16a)
Hamilton-Kenyon Bubble Model
Buhlman Bubble Model (VPM-X)
US Navy 1965 (12-Compartment Parallel)
3.2 Parallel Model Overview
These models simultaneously load all of the theoretical
compartments with inert gas at an exponential rate based
upon each compartment’s half-time. All models use a value
for each compartment that determines its supersaturation
gradient. The Buhlmann model uses two factors (“a” and
“b”) and the other models use a value called “M”. The
compartment that has the “deepest” minimum tolerable
ambient pressure is said to be the “controlling” compartment,
based upon the compartments inert gas load factored against
its allowable amount of supersaturation (“a” and “b”, or
“M”). Theoretically, as long as the diver does not ascend
above the minimum allowable depth, no clinically observable
decompression illness symptoms are likely to be observed.
The Buhlmann models are “folded” into many popular dive
computers that are made in Europe. (Interestingly, these
machines only track eight (8) compartments, therefore a
NAUTILUS derived repetitive dive profile will be more
conservative than a dive computer using what is billed to be
the “Buhlmann” model!) Buhlmann models track helium
loading and allow for the tracking of helium + nitrogen
loading in the theoretical compartments. These methods
were first used in manned dives in the early and mid 1960’s.
The 10 Compartment Parallel, 12-Compartment model and
US Navy model are based on the calculation methods
derived by the Haldane’s dating back to the early 1900’s.
The 10 Compartment model is used in many US made dive
computers and the 12 Compartment model was used in the
Orca Edge Dive computer. In 1989, Nafe was able to
extend Huggins 12-Compartment model to track using the
same computational method that Buhlmann had been using
for the previous 25+ years. Nautilus allows the tracking of
helium in the diver’s breathing mixture using this
computational method, which is similar to using “equivalent
air depth” for employing an air table while breathing nitrox.
No diving profile or decompressionNo diving profile or decompression
No diving profile or decompressionNo diving profile or decompression
No diving profile or decompression
model including those generatedmodel including those generated
model including those generatedmodel including those generated
model including those generated
from within NAUTILUS can assurefrom within NAUTILUS can assure
from within NAUTILUS can assurefrom within NAUTILUS can assure
from within NAUTILUS can assure
me that I will not be injured orme that I will not be injured or
me that I will not be injured orme that I will not be injured or
me that I will not be injured or
killed.killed.
killed.killed.
killed.
