*If none of the buttons are pressed for about 3 minutes during each of the displays of the dive plan mode, the watch automatically returns to the time mode of the standard mode.
*The dive condition mark of the dive plan display changes to the high altitude mark in environments at an air pressure equivalent to
2. NITROX Setting
The NITROX setting is for use when diving with a mixed gas having an oxygen concentration that differs from that of air tanks used for ordinary diving (oxygen concentration: 21%). Set the watch to AIR for all other types of diving. The watch will return to the AIR dive mode automatically after 6 hours have elpased without diving, or, 30 minutes have elpased during surface interval time after NITROX diving.
DANGER
Always double check the oxygen concentration (O2%) before each and every NITROX dive.
It is very important to ensure that the percentage of oxygen carried in your tank, maches the setting of the watch exactly. Failure to comply with this instruction may result in decompression sickness, oxgen toxication or death .
The oxygen concentration (O2%) setting cannot be changed whilst diving, therfore always check that the correct O2% is set before diving.
3. High-Altitude Setting
Since air pressure decreases at high altitudes, it is necessary to take this change in air pressure into consideration when calculating the body partial pressure of oxygen. This watch periodically measures air pressure and then calculates the body partial pressure of oxygen each time based on the measured air pressure, thereby eliminating the need to manually set the watch for high altitudes. In environments where air pressure is low, the watch automatically judges the environment to be a
altitude mark ( 
or 
). The altitude at which the dive condition mark changes to the high altitude mark is about 300 m (1,000 ft) above sea level.
CAUTION
The high altitude mark is only intended to serve as a general indicator of high altitude. There may be times when the dive condition mark does not change to the high altitude mark even at altitudes above 300 m (1,000 ft) above sea level, or times when the dive condition mark changes to the high altitude mark even though the watch is at a low altitude below 300 m (1,000 ft) above sea level. In any case, the watch can still be used without risk since the dive computer calculates the body partial pressure of oxygen corresponding to the air pressure at that time.
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