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49
Air Time Remaining (ATR) bar graph regardless of what is displayed in the
numeric Dive Time Remaining display. The ATR bar graph will provide the only
source of Air Time information if you are in a decompression or violation mode.
The DataTrans calculates Air Time Remaining using a patented algorithm that
is based on a diver's individual air consumption rate and depth. Tank pressure is
measured once each second, and an average rate of consumption is calculated over
a 90 second period. This rate of consumption is then used in conjunction with a
knowledge of the depth dependence to predict the air required for a safe ascent
including any required decompression stops.
Air consumption and depth are continuously monitored, and Air Time Remain-
ing reflects any change in your circumstances. For example, when a buddy starts
breathing from your octopus or you suddenly find yourself swimming against a
strong current, the DataTrans will recognize this change and adjust your Air Time
Remaining accordingly.
Remember, the Air Time Remaining is the time you can remain at the present
depth and still surface with your own personally selected tank pressure reserve
(Air Alarm Set Point). When the ATR indicates zero, you should initiate an
immediate ascent. However, there is no reason to panic. The DataTrans has
allowed for the air necessary for a safe ascent including any decompression stops.
Fig. 46 - Air
Dive Time Remaining
®
PSI
FT
a.
57

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