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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 cal c ul a ted based on
the amount of Nitrogen absorbed by hypothetical tissue compart-
ments. The rates each of these compartments absorb and
rel e ase Nitrogen is mathematical l y model e d and compared
against a maximum al l o wabl e Nitrogen l e vel . hichever one is
cl o sest to this maximum l e vel is the control l i ng compartment for
that Depth. Its resul t ing val u e wil l be displ a yed numerical l y
al o ng with the symbol s TIME and NDC (Fig. 63a) and graphi-
cal l y as the Nitrogen Loading Bar Graph (Fig. 63b).
As you ascend from Depth fol l o wing a dive that has approached
the No Decompression Limit, the NIBG segments wil l recede as
control shifts to sl o wer compartments. This is a feature of the
Decompression Model that is the basis for Mul t il e vel Diving, one
of the most important advantages that AERIS dive computers
offer.
b
a
The El i te T3's al g orithm is based upon Hal d ane’s theory using
maximum al l o wabl e nitrogen l e vel s devel o ped by Merril l Spen-
cer. Repetitive diving control is based upon experiments de-
signed and conducted by Dr. Ray Rogers and Dr. Michael
Powel l in 1987. Diving Science and Technol o gy (DSAT), a
corporate affil i ate of PADI , commissioned these experiments.
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