Switch window Switch window content Explanation
switch window turns red until you ascend
shallower than the MOD depth.
MOD Maximum Operating Depth. MOD is the depth
at which the partial pressure of oxygen (ppO2)
of the gas mix exceeds a safe limit.
Average depth The average depth of the current dive is
calculated from the moment the start depth is
exceeded until the dive ends.
Sunset ETA The estimated time until sunset expressed in
hours and minutes. Sunset time is determined
via GPS, so your watch relies on the GPS data
from the last time you used GPS.
Gradient factors The Gradient Factor value you have defined in
the Algorithm settings. See 5.7. Algorithm
settings and 5.7.2. Gradient Factors for more
information about the dive algorithm and
Gradient Factors.
Dynamic values
Some values are visible in the switch window by default. The values appear in the window
only if they are triggered by an alarm or event.
OTU
Oxygen tolerance unit. It is used to measure the whole-body toxicity, caused by prolonged
exposure to high oxygen partial pressures. Suunto Ocean alarms you when the daily
recommended limit reaches 250 (caution) and 300 (warning).
CNS
Central nervous system toxicity. The CNS value is a measure of how long you have been
exposed to elevated partial pressures of oxygen (ppO2), displayed as a percentage of a
maximum allowable exposure. Suunto Ocean alarms you when CNS% reaches 80% (caution)
and when the 100% limit (warning) is exceeded.
The oxygen exposure calculations are based on currently accepted exposure time limit tables
and principles. The limits are based on the NOAA Diving Manual. The CNS percentage is
calculated continuously when in diving mode, even when on the surface.
In addition to this, the dive computer uses several methods to conservatively estimate the
oxygen exposure. For example:
Suunto Ocean
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