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6 Diving in mountain lakes
III UWATEC
®
Aladin
®
dive computers
III
Altitude range 2
Altitude icon
Altitude ranges
6.3 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 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.
TEC If an ascent to a prohibited altitude is detected,
an audible alarm goes off for 1 minute (patent pen-
ding).
Descend to a lower altitude.
Ascent to altitude range 3
and 4 prohibited.
Max. allowed altitude:
2650 m (8694 ft).
6.4 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, the dive planner is not available anymore.
Dive at altitude range 4:
• no deco data
(autom. gauge mode)
6.1 Altimeter
The altitude adjustment ->39 does not affect altitude ranges nor any calculations.
6.2 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 pressu-
re. That is why the defined altitude ranges overlap on their fringes. If a moun-
tain 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 (3300 feet) is not indicated. In the following diagram, you
can see the
approximate breakdown
of the altitude ranges
:
