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English
ALADIN H USER MANUAL
3.6 Diving in mountain lakes
3.6.1
Altimeter
The altitude adjustment (see chapter:
SETTINGS, section: Altitude adjustment
)
does not affect altitude classes nor any
calculations.
3.6.2
Altitude classes
The Aladin H 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 class (1-4) and the
desaturation time. Desaturation time
indicated at this moment refers to the
adaptation time at this altitude. If the dive
starts within this adaptation time, the Aladin
H treats it as a repetitive dive, since the
body is off-gassing.
Altitude is divided into 5 classes, which
are influenced by barometric pressure.
That is why the defined altitude classes
overlap on their fringes. If a mountain lake
is reached, the altitude class is indicated
at the surface (time of day display), in the
logbook and in the dive planner with a
stylized mountain icon and the current
altitude class. The altitude from sea level
to approximately 1000m/3280ft is not
indicated. In the following diagram, you
can see the approximate breakdown of the
altitude classes:
Altitude Class
Elevation Barometric
switch point
Dive computer
mode
GAUGE
(no deco data)
SCUBA
SCUBA
SCUBA
SCUBA
3.6.3
Prohibited altitude
Ascent to altitude class 3 and 4 is
prohibited. Maximum allowed altitude:
2650m/8694ft.
WARNING
At the surface, the Aladin H shows, via flashing
altitude class number, the altitude to which you
may not rise. The ascent prohibition is displayed
together with the current altitude class.
Example:
You are at 1200m/3937ft (altitude class
1) and you may ascend to class 2 only
(2650m/8694ft). You may not rise to the
altitude classes 3 or 4.
WARNING
If an ascent to a prohibited altitude is detected,
an audible alarm sounds for 1 minute. Descend
to a lower altitude.
3.6.4
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 classes 1, 2 and 3. The
prescribed decompression stop depths
are in sequence (2m/7ft, 4m/13ft, 6m/20ft,
9m/30ft…).
If atmospheric pressure is below
620mbar/8.99psi (altitude higher than
4100m/13450ft above sea level), the Aladin
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