Hi,
The difference in pressure groups (as mentioned by awap) is irrelevant as the pressure groups are not interchangeable between different tables, however:
NAUI
The NAUI tables are modified US Navy tables, the US Navy NDLs are reduced by between 1 and 3 groups dependent upon depth. Repetitive Dives are based on the off gassing of the 120 minute compartment, however off gassing is calculated at 24 hours instead of the 12 hours of the US tables.
PADI
The standard US Navy Tables were designed primarily as decompression tables for Military divers with an unlimited Air Supply working at a single depth, these were then adapted with the advent of SCUBA: With more recreational diving it was found that significant bubble formation has been found with divers diving to these limits
Therefore with the PADI table (RDP) the maximum allowable nitrogen levels on surfacing (M Values) have been reduced significantly resulting in shorter NDLs. They also decided that a 60 minute controlling compartment for off gassing is more relevant to recreational divers, thus off gassing twice as quick as using the NAUI tables.
IN summary
PADI use a lower M-value for surfacing resulting in shorter No decompression Limits
PADI use a 60 minute off gassing control resulting in shorter surface intervals
Paul
The difference in pressure groups (as mentioned by awap) is irrelevant as the pressure groups are not interchangeable between different tables, however:
NAUI
The NAUI tables are modified US Navy tables, the US Navy NDLs are reduced by between 1 and 3 groups dependent upon depth. Repetitive Dives are based on the off gassing of the 120 minute compartment, however off gassing is calculated at 24 hours instead of the 12 hours of the US tables.
PADI
The standard US Navy Tables were designed primarily as decompression tables for Military divers with an unlimited Air Supply working at a single depth, these were then adapted with the advent of SCUBA: With more recreational diving it was found that significant bubble formation has been found with divers diving to these limits
Therefore with the PADI table (RDP) the maximum allowable nitrogen levels on surfacing (M Values) have been reduced significantly resulting in shorter NDLs. They also decided that a 60 minute controlling compartment for off gassing is more relevant to recreational divers, thus off gassing twice as quick as using the NAUI tables.
IN summary
PADI use a lower M-value for surfacing resulting in shorter No decompression Limits
PADI use a 60 minute off gassing control resulting in shorter surface intervals
Paul
