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I have a basic Nitrox question that I wonder if someone could answer. I'm currently taking the (first) IANTD EANx course and I don't understand their (or is it NOAA's?) recommended procedure for resetting the CNS clock. The EANx student manual and workbook (3rd ed, 1/94), states: Refering to the NOAA O2 exposure limits, "If one of more dives within a 24 hour period has reached or exceeded the limits for a normal single exposure, the diver must spend a minimum of two hours at a normoxic PO2 before diving again. If one of more dives within a 24 hour period have reached the maximum total 24 hour day limits, the diver must spend a minimum of 12 hours at a normoxic PO2 before diving again." What I'm wondering is, where does the 24 hour period begin or end? What happens if I exceed the limits over 2 dives within 24 hours, and sit out my two hour normoxic interval? How do I track myself then? I searched the archives and came up with suggestions that halftimes between 75 and 90 minutes be used to relax the clock. A halftime based decay calculation, while not that difficult, seems out of spirit with the fairly simple techniques that IANTD is describing above. Is there a procedure compatible with IANTD's guidelines described above? Oliver
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