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III UWATEC
®
Aladin
®
ONE
7 Diving in mountain lakes
NO
7.2 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).
DEPTH
DIVE
TIME
Dive at altitude range 4:
no deco data
(autom. gauge mode)
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
Altitude symbol
Time interval since the last
change in altitude class
Desaturation
information
7.1 Altitude ranges Aladin
®
ONE 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 alti
-
tude symbol,
the
adaption time (desaturation time) as a
bar graph and the
time interval since the change in altitude class
.
Desaturation time refers to
adaptation time at this altitude. If the dive starts within this adaptation time,
Aladin
®
ONE
treats it as a repetitive dive, since the body is offgassing.
Altitude is divided into five ranges, which are influenced by barometric pres-
sure. That is why the defined altitude ranges overlap on their fringes. If a
mountain lake is reached, the stylised mountain symbol lights up to indicate
that the Aladin
ONE is now in altitude mode, without differentiation between
the various ranges. The actual altitude range can be seen after downloading
Aladin ONE to a PC via SmartTRAK.
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
:
20


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