Uwatec Xtender User Manual page 21

and "light/set" buttons respectively increase and decrease the depth indicated.
If Xtender is set for a Nitrox mixture, the planner will show the times permissible
with that FO , and will indicate the oxygen partial pressure at various depths. If
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this exceeds 1.4 bar, instead of the minutes, "- -" will be displayed. When the
computer is in safety block mode, the dive planner is not available.
mode
indicator
Figure 11
Resetting FO
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When you use Nitrox (FO equal to or greater than 22%), at midnight Xtender
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switches to a predefi ned setting ("- -") and the Nitrox icon (NX) fl ashes. If you
access Dive Mode after the FO has been reset, an alarm is activated. If you
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ignore it and begin your dive without setting a new FO , Xtender will base its
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calculations on a fi ctitious mixture of 99% O – 79% nitrogen.
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Logbook and History
The Logbook mode allows you to view information about your past dives. That
data will only be saved if the diver has spent at least three minutes at a depth
equal to or greater than 1.5 meters (fi ve feet). The data are saved in sequence
until the computer memory is full; 30 dives can be stored, and after that the oldest
dives will be overwritten. The logbook opens to the History display, and shows a
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