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VTX OPERATING MANUAL
© 2002 Design, 2014 Doc. No. 12-5382-r01 (10/24/14)
FFT
GAS 1 GTR
PSI
1750 73
104
AR
TL
0:16
NDC
0:23
EDT
SAFETY STOP (SS)
If set ON:
Upon ascent to within 5 FT (1.5 M) deeper than the SS Depth set for 1 second on a No Deco dive in which Depth exceeded 30
FT (9 M) for 1 second, a beep will sound and a SS at the Depth set will appear on the Main display with a countdown beginning
at the SS Time set and counting down to 0:00 (min:sec).
• If the SS was set for OFF or TIMER, this display will not appear.
• In the event that you descend 10 FT (3 M) deeper than the Stop Depth for 10 seconds during the countdown, or the
countdown reaches 0:00, the No Deco Main screen will replace the SS Main screen which will reappear upon ascent to
within 5 FT (1.5 M) deeper than the Safety Stop Depth set for 1 second.
• In the event that you enter Deco during the dive, complete the Deco obligation, then descend below 30 FT (9 M); the SS
Main will appear again upon ascent to within 5 FT (1.5 M) deeper than the SS Depth set for 1 second.
• If you surface prior to completing the SS, it will be disabed for the remainder of that dive.
• There is no Penalty if you surface prior to completing the SS or ignore it.
DIVE TIME REMAINING (DTR)
The VTX constantly monitors nitrogen loading and oxygen accumulation, and will display whichever time is the least amount
available as DTR on the No Deco Dive Main screen (Fig. 38a). The graphic NDC, or OTR, will identify which time is being
displayed.
No Deco DTR (NDC)
NDC is the maximum amount of time that you can stay at your present Depth before entering Deco. It is calculated based on the
amount of Nitrogen absorbed by hypothetical tissue compartments. The rates each of these compartments absorb and release
Nitrogen is mathematically modeled and compared against a maximum allowable Nitrogen level.
Whichever one is closest to this maximum level is the controlling compartment for that Depth. Its resulting value will be displayed
as NDC time and graphically as the TLBG.
As you ascend, the TLBG segments will recede as control shifts to slower compartments.
This is a feature of the decompression
model that is the basis for multilevel diving, one of the most important advantages that Oceanic dive computers offer.
O2 Time Remaining (OTR)
During Nitrox operation, O2 accumulation during a dive, or 24 hour period, is displayed as a percent of O2 saturation allowed
per dive or per day. Max allowed (100%) is 300 OTU.
When time remaining before reaching the O2 limit becomes less than NDC, calculations for that Depth will be controlled by O2
and OTR will be displayed as DTR on the Dive Main.
GAS TIME REMAINING (GTR)
GTR is
calculated using a patented algorithm that is based on a diver's individual Air (Gas) Consumption Rate and Current
Depth. Tank Pressure is measured once each second and an average rate of Consumption is calculated over a 90 second pe-
riod. This Rate of Consumption is then used in conjunction with the Depth to predict the Air (Gas) required for the diver to make
a safe controlled Ascent including the No Deco Deep and Safety Stops and any required Deco Stops.
Air (Gas) Consumption and Depth are continuously monitored and GTR reflects any change in circumstances. For example,
when you suddenly find yourself swimming against a strong current and begin breathing more rapidly, the VTX will recognize the
change and adjust GTR accordingly.
GTR is the time you can remain at the present Depth and still safely surface with the Tank Pressure reserve that you selected dur-
ing setup (End Pressure Alarm Setting).
GTR is displayed on the Dive Main screens (Fig. 38b).
GTR Alarm
When GTR decreases to 5 minutes, the Audible will sound and the GTR time digits and graphic will flash yellow (Fig. 39). If it
decreases to 0, the Audible will sound again. The time digits and graphic will continue to flash red until GTR becomes greater
than 1 minute, then it will flash yellow until greater than 5 minutes.
You should initiate a controlled Ascent while monitoring Tank Pressure. However, there is no reason to panic, the VTX has al-
lowed for the air necessary for a safe ascent including the No Deco Deep and Safety Stops, if set On, and any Deco Stops
required.
Fig. 38 -NO DECO MAIN
(NDC is DTR)
Fig. 39 - NO DECO MAIN
(GTR 5 min warning)
FT
GAS 1 GTR
PSI
540
5
68
TL
AR
0:11
NDC
0:52
EDT
a b