Operation Manual

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27
6 Diving in mountain lakes
III UWATEC Aladin PRIME
III
Altitude range 2
Altitude icon
Altitude ranges
6.2 Prohibited altitude
Aladin 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 1200m (3937ft) (altitude range 1) and you may ascend to
range 2 only (2650m / 8694ft). You may not rise to the altitude range 3 or 4.
Ascent to altitude range 3
and 4 prohibited.
Max allowed altitude: 2650
m (8694ft).
6.3 Decompression dives in mountain lakes
In order to assure optimal decompression even at higher altitudes, the 3m
(10ft) decompression stage is divided into a 4m (13ft) stage and a 2m (7ft)
stage in altitude ranges 1, 2 and 3. The prescribed decompression stop depths
are, in sequence, 2m / 4m / 6m / 9m… (7ft / 13ft / 20ft / 30ft…).
If atmospheric pressure is below 620mbar (8.99psi) (altitude higher than
4100m / 13450ft above sea level), no decompression data is calculated and
displayed (automatic gauge mode).
In addition, the dive planner is not available anymore.

DEPTH
DIVE TIME
Dive at altitude range 4:
• no deco data
(autom. gauge mode)
WARNING
Max altitude: 850m 1650m 2650m 4000m
2790ft 5413ft 8694ft 13120ft
4000m
13120ft
2000m
6560ft
1000m
3280ft
3000m
9840ft
0m
905mbar
13.12psi
815mbar
11.82psi
725mbar
10.51psi
610mbar
8.85psi
Switching
at approx.
No deco data
gauge mode
6.1 Altitude ranges Aladin 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,
Aladin 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 altitude range is indicated at the surface (time
of day display), in the logbook and in the dive planner by a stylised mountain
and the current altitude range. Sea level to an altitude of approximately 1000m
(3300ft) is not indicated. In the following
diagram, you can see the
approximate breakdown
of the altitude ranges :