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are available for divers who dive constantly and are ready to accept
greater personal risk.
CAUTION: Always use the same personal and altitude
adjustment settings for the actual dive and for the planning.
Increasing the personal adjustment setting from the planned
setting as well as increasing the altitude adjustment setting can
lead to longer decompression times deeper and thus to larger
required gas volume. You can run out of breathing gas underwater
if the personal adjustment setting has been changed after dive
planning.
3.23.2 Altitude diving
The atmospheric pressure is lower at high altitudes than at sea
level. After traveling to a higher altitude, you will have additional
nitrogen in your body, compared to the equilibrium situation at the
original altitude. This 'additional' nitrogen is released gradually
over time and equilibrium is restored. It is recommended that you
acclimatize to a new altitude by waiting at least three hours before
making a dive.
Before high-altitude diving, you need to adjust the altitude settings
of your dive computer so that the calculations take into account the
high altitude. The maximum partial pressures of nitrogen allowed
by the mathematical model of the dive computer are reduced
according to the lower ambient pressure.
As a result, the allowed no decompression stop limits are
considerably reduced.
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