SUUNTO VYTEC - Manual (Page 27)

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The remaining air time calculation includes a 35 bar [500 psi] safety
reserve. This means that when the instrument shows the air time to be
zero, there is still about 35 bar [500 psi] pressure left in your cylinder
depending on your air consumption rate. With a high consumption rate
the limit will be close to 50 bar [725 psi] and with a low rate close to 35
bar [500 psi].
NOTE! Filling your BC will affect the air time calculation, due to the
temporary increase in air consumption.
NOTE! A change of temperature will affect the cylinder pressure and
consequently the air time calculation.
Low Air Pressure Warnings
The dive computer will warn you with three audible double beeps and a
blinking pressure display when the cylinder pressure reaches 50 bar
[725 psi] (Fig. 3.12.). Three double beeps are also heard when the
cylinder pressure goes down to the user selected alarm pressure and
when the remaining air time reaches zero.
3.3.4. Consumed Bottom Time (CBT)
The available no-decompression stop time is also shown visually in the
multi-function bar graph on the left side of the display (Fig. 3.7., 3.8.
and 3.9.). When your available no-decompression time decreases be-
low 200 minutes, the first (lowest) bar graph segment appears. As your
body absorbs more nitrogen, more segments start to appear.
White Zone - As a safety precaution Suunto recommends you should
maintain the no-decompression bar graph within the white zone. Seg-
ments start to appear when the available no-decompression time de-
creases below 100, 80, 60, 50, 40, 30 and 20 minutes.
Gray Zone- As the bars reach the gray zone, your no-decompression
stop time is less than 10 or 5 minutes and you are getting very close to
no-decompression limits. At this point, you should start your ascent
towards the surface.
Red Zone – As all of the bars appear (red zone), your no-decompres-
sion stop time has become zero and your dive has become a decom-
pression stop dive (for more information see section 3.3.6. “Decom-
pression dives”).
3.3.5. Ascent Rate Indicator
The ascent rate is shown graphically along the right side of the display
as follows: