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6 Diving in mountain lakes
III UWATEC
®
Smart dive computers
III
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Altitude range 1
Desaturation time
Adaptation time
Altitude ranges
1 2 3 4
6.2 Prohibited altitude
TEC shows via flashing altitude 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 alti-
tude 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 indi-
cated.
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Dive at altitude range 4:
• no deco data
• no RBT
6.1 Altitude ranges
TEC measures the atmospheric pressure every 60 seconds even while the dis-
play 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,
TEC 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, in the log-
book 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:
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
WARNING
Max. altitude:
850 m
1650 m
2650 m
4000 m
2790 ft
5413 ft
8694 ft
13120 ft
