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ALTITUDE DIVING

The atmospheric pressure is lower at high altitudes than at sea level. After traveling

to a higher altitude, the diver will have additional nitrogen in his body, compared

to the equilibrium situation at the original altitude. This “additional” nitrogen is

released gradually in time and equilibrium is reached within a couple of days. Do

not dive until the equilibrium is reached.

Before high altitude diving the instrument must be set to the high altitude diving

mode to adjust the calculations for the new altitude. The maximum partial pres-

sures 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 limits are considerably reduced.

SURFACE INTERVALS

The dive computer requires a minimum surface interval of 5 minutes between

dives. If a surface interval is shorter than 5 minutes, the instrument dive counter

and dive timer treat the next dive as a continuation of the previous dive. It adds

the dive times, and calculates no-decompression limits or decompression stops

based on excess nitrogen absorbed on both dives.

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Suunto Vyper User Manual Page 66