sam1
Contributor
I note that the NDL for the PADI and NAUI tables for the first dive in the example above (60 feet) are the same: 55 minutes. The difference noted shows up in the second dive. I really don't know the NAUI tables, but Thalassamania (above) notes that the NAUI tables are based on the U.S. Navy tables. PADI's Encyclopedia of Recreational Diving (p. 5-62) says that the surface interval credit in the Navy tables assumes that the 2-hour compartment controls the repetitive dive. The PADI tables assume it's the 60-minute compartment that does (so any given surface interval reduces your residual nitrogen in the controlling compartment by more in the PADI tables than in the NAUI tables, thus longer NDL for repetitive dives).
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