That is nice to know as I have fundies planned for next year. But until then, is there a DIR way of doing NDL dives? Having just run some figures through various models to work out a 30m dive with 32% I get.

USN (Unmodified) - 40mins
PADI - 40mins (AIUI PADI are USN but slightly modified)
USN (Dop Mod'd) - 30mins
V-Planner (+2 cons) - 50mins
V-Planner (+4 cons) - 39mins
Suunto (RGBM) - 42mins

So 40 mins would be a good figure for a square dive, but what about multi-level knowing how difficult it is to pre-dive judge depths/times for multi-level dive calculations (and that isn't just my bouyancy control )

Thanks