Oceanic ATOM 2.0 Manual De Usuario

No Decompression Dive Time Remaining (NDC)

No Decompression Dive Time Remaining 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 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 will be displayed numerically

along with the symbols TIME and NDC (Fig. 79a) and graphi-

cally as the Tissue Loading Bar Graph (Fig. 79b).

As you ascend from Depth following a dive that has approached

the No Decompression Limit, the Nitrogen Bar Graph segments

will recede as control shifts to slower compartments. This is a

feature of the Decompression Model that is the basis for Multi-

level Diving, one of the most important advantages that Oceanic

dive computers offer.

The ATOM's algorithm is based upon Haldanes theory using

maximum allowable nitrogen levels developed by Merrill Spen-

cer. Repetitive diving control is based upon experiments de-

signed and conducted by Dr. Ray Rogers and Dr. Michael

Powell in 1987. Diving Science and Technology

(DSAT), a

corporate affiliate of PADI

, commissioned these experiments.

Fig. 79 - NO DECO DTR