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105
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4000 m
13120 ft
2000
m
6560 ft
1000
m
3280 ft
3000
m
9840 ft
0
m
905 mbar
13.12 psi
815 mbar
11.82 psi
725 mbar
10.51 psi
610 mbar
8.85 psi
Switching
at approx.
No deco data
gauge mode
English
25
6 Diving in mountain lakes
UWATEC
®
Smart dive computers
III
Altitude range 1
Desaturation time
Adaptation time
Altitude ranges
1 2 3 4
6.2 Prohibited altitude
Smart Z shows via flashing alti
tude segments while
at the surface to which altitude
the diver may not
rise.
The ascent prohibition can also be displayed together with an
altitude range:
Example: You are at 1200 m (3937 ft) (altitude
range 1) and you may ascend to range 2 only
(2650 m / 8694 feet). You may not rise to the
altitude range 3 or 4.
Ascent to altitude range 3
and 4 prohibited.
Max. allowed altitude:
2650 m (8694 ft).
6.3 Decompression dives in mountain lakes
In order to assure optimal decompression even at higher altitudes, the 3m (10
ft) decompression stage is divided into a 4 m (13 ft) stage and a 2 m (7 ft) stage
in altitude ranges 1, 2 and 3. The prescribed decompression stop depths are, in
sequence, 2m / 4m / 6m / 9m… (7 ft / 13 ft / 20 ft / 30 ft…).
If atmospheric pressure is below 620 mbar (8.99 psi) (altitude higher than
4100 m / 13450 ft above sea level), no decompression data is calculated and
displayed (automatic gauge mode). In addition RBT and the dive planner are
not available anymore. The oxygen toxicity and the tank pressure are still
indicated.
%
Dive at altitude range 4:
• no deco data
• no RBT
6.1 Altitude ranges Smart Z measures the atmospheric pressure every 60 seconds even while the
display is switched off. If the computer detects a sufficient increase in altitude,
it switches on automatically and indicates the new altitude range (1-4) and
the desaturation time. Desaturation time indicated at this moment refers to
adaptation time at this altitude. If the dive starts within this adaptation time,
Smart Z treats it as a repetitive dive,
since the body is offgassing.
Altitude is divided into five ranges, which are influenced by barometric pressure
.
That is why the defined altitude ranges overlap on their fringes. If a mountain
lake is reached, the altitude range is indicated at the surface, in the logbook
and in the dive planner by a stylised mountain
filled with one or more of
4 segments representing the 4 ranges. Sea level to an altitude of approximately
1000m (3300 feet) is not indicated. In the following
diagram, you can see the
approximate breakdown of
the altitude ranges
:
WARNING
Max. altitude: 850 m 1650 m 2650 m 4000 m
2790 ft 5413 ft 8694 ft 13120 ft
105


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