Design Aeris, Reference Manual

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ATR will fluctuate throughout your dive, decreasing as you dive deeper or breath heavier,
and increasing as you ascend to shallower depths or relax your breathing efforts.
Since air consumption and depth are continuously monitored, ATR reflects any change in
your circumstances, such as when a buddy starts breathing from your octopus or you swim
against a strong current and begin breathing more rapidly. The dive computer will recog-
nize this change and adjust ATR as required.
ATR appears as the numeric DTR display when it is less than NDC and OTR.
When ATR decreases to 5 minutes, an alarm strikes which means that only 5 minutes
remain before your air supply will be reduced to the minimum level necessary to perform
a safe ascent, including any planned (Deep and Safety) stops and required (Deco) stops,
and still provide a tank pressure reserve upon surfacing.
When ATR decreases to 0 (min), an alarm will strike again. There is no need to panic,
calculations allow for the air you will consume while making a safe controlled ascent, in-
cluding that the stops, and still provide the surfacing tank pressure reserve.
DTR is not displayed in Decompression modes (No Deco time is 0 and in control). ATR
will be displayed on a Alternate screen that can be accessed.
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