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3.8. HIGH ALTITUDE DIVES AND PERSONAL
ADJUSTMENT
The dive computer can be adjusted both for diving at altitude and also to
increase the conservatism of the mathematical nitrogen model.
3.8.1. Altitude Adjustment
When programming the instrument for the correct altitude, you need to
select the correct Altitude Mode according to Table 3.4. The dive com-
puter will adjust its mathematical model according to the entered altitude
mode, giving shorter no-decompression times at higher altitudes (see
Section 6.1. ”Operating Principles”, Table 6.1. and 6.2.).
TABLE 3.4. ALTITUDE ADJUSTMENT RANGES
The entered Altitude Adjustment Mode is indicated by mountain symbols
(A0, A1 = one mountain, or A2 = two mountains). Section 4.3.1.1. ”Al-
titude Adjustment and Personal Adjustment Setting” describes how the
Altitude Mode is adjusted.
Traveling to a higher elevation can temporarily cause a change in the
equilibrium of dissolved nitrogen in the body. It is recommended that
you acclimate to the new altitude by waiting at least three hours before
making a dive.
3.8.2. Personal Adjustment
There are adverse personal factors for DCI which divers can predict
in advance and input into the decompression model. Factors that may
affect susceptibility to decompression illness vary between divers and
also for the same diver from one day to another. The three-step Personal
Adjustment Mode is available, if a more conservative dive plan is desired.
For very experienced divers, a two step adjustment for RGBM effect on
repetitive dives is available.
The personal factors which tend to increase the possibility of DCI include,
but are not limited to:
Altitude
mode
Symbol
on display
Altitude
range
A0
A1
A2
0 - 300 m [0 - 1000 ft]
300 - 1500 m [1000 - 5000 ft]
1500 - 3000 m [5000 - 10000] ft]