Suunto VYTEC DS manual High Altitude Dives and Personal Adjustment, Altitude Adjustment

3.8.HIGH ALTITUDE DIVES AND PERSONAL ADJUSTMENT

The dive computer can be adjusted both for diving at altitude and also to increase the conservatism of the mathematical nitrogen model.

3.8.1. Altitude Adjustment

When programming the instrument for the correct altitude, you need to select the correct Altitude Mode according to Table 3.4. The dive com- puter will adjust its mathematical model according to the entered altitude mode, giving shorter no-decompression times at higher altitudes (see Section 6.1. ”Operating Principles”, Table 6.1. and 6.2.).

TABLE 3.4. ALTITUDE ADJUSTMENT RANGES

Altitude	Symbol	Altitude
mode	on display	range
A0		0 - 300 m [0 - 1000 ft]
A1		300 - 1500 m [1000 - 5000 ft]
A2		1500 - 3000 m [5000 - 10000] ft]

The entered Altitude Adjustment Mode is indicated by mountain symbols (A0, A1 = one mountain, or A2 = two mountains). Section 4.3.1.1. ”Al- titude Adjustment and Personal Adjustment Setting” describes how the Altitude Mode is adjusted.

Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimate to the new altitude by waiting at least three hours before making a dive.

3.8.2. Personal Adjustment

There are adverse personal factors for DCI which divers can predict in advance and input into the decompression model. Factors that may affect susceptibility to decompression illness vary between divers and also for the same diver from one day to another. The three-step Personal Adjustment Mode is available, if a more conservative dive plan is desired. For very experienced divers, a two step adjustment for RGBM effect on repetitive dives is available.

The personal factors which tend to increase the possibility of DCI include, but are not limited to:

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