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DTR (DIVE TIME REMAINING)
The GEO 2 constantly monitors No Deco status and O2 Ac-
cumulation, and will display whichever Time is the least amount
available as DTR on the No Deco Dive Main screen. The Time
being displayed will be identified by the NDC or O2 icon.
NDC (No Deco DTR)
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 compart-
ments.
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 (NDC) will be
displayed as DTR (Fig. 70a). It will also be displayed graphi-
cally as the TLBG (Fig. 70b).
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.
b
Fig.70-NODECOMAIN
a