Suunto D4 User Manual page 40

At this time, perform your pre-checks, making sure that:
the instrument operates in the correct mode and provides a complete display
•
(AIR/NITROX/FREE mode)
the battery level is ok
•
the altitude, personal adjustment, Safety/Deep stops, and RGBM settings are
•
correct
the instrument displays correct units of measurement (Metric/Imperial)
•
the instrument displays the correct temperature and depth (0.0 m/0 ft)
•
the alarm beeps
•
And, if set to NITROX mode, make sure that:
the correct oxygen percentage is adjusted according to the measured oxygen
•
percentage in your cylinder
the oxygen partial pressure limit is set correctly
•
For more information on the NITROX mode, refer to Section 6.2. Diving in NITROX
mode (DIVEnitrox).
The dive computer is now ready for diving.
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