On Tue, 11 Nov 1997, Dennis JR Harding wrote:
> In short: What is the rate at witch OTU's decrease?
> The REPEX chart, again is a guide line, just like deco 
> schedules, your are never fully gaurenteed that it works 
> 100%, but is there a way of building a credit, say should 
> you not dive on day 4 through 6, and again on day 7.
> I know there may not be specific answers to the above, but 
>  how do you treat this point on long expeditions, or is it simply ignored?

As a practical matter,  many people
just take one day off diving a week, as a general curative for
all your clocks - CNS, N2, He, OTU's.  If you're pulling
really long bottom times, take an additional day off.

> 
> I raise this question from a deco schedule I prepared using the 
>one of the computer deco software programs.  Day one conisted of 
>two dives, 50m and 40m with a 5 hour surface interval.  After 
>futher 24 hour surface interval the 3rd dive of the expedition 
>was planned.  There was no decrease in the OTU for this period, 
>yet CNS had decreased to virtually zero.  Do the two not go hand in hand.

The answer is that most software won't track your OTU's across
multiple days using REPEX decay - it's not worth the coding hassel,
since most people just ignore it anyway.  You can always just
figure it out yourself.

The CNS clock should be decreasing - most packages use a 90 minute
default half-time for the CNS clock, which makes it easy to track
(software-wise) for repetetive dives.

Algorithmically, there's really no link between OTU's and CNS%.

-Will
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