DIVE TIME REMAINING (DTR)
One of the most important pieces of information on Oceanic dive computers is the Dive Time Remaining numeric display.
The GEO constantly monitors No Decompression status and Oxygen Accumula- tion.
The Dive Time Remaining display will indicate the No Deco Time or O2 Time, whichever Time is the least amount available.
No Decompression Dive Time Remaining (NDC)
NDC is the maximum amount of time that you can stay at your present Depth before entering a Decompression situation. 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 numerically along with the TIME and NDC icons
(Fig. 64a) and graphically as the TLBG (Fig. 64b). | b | a |
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As you ascend from Depth following a dive that has approached the No Decompression Limit, 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 features that Oceanic dive computers offer.
Fig. 64 - NO DECO
DIVE TIME REMAIN-
ING
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