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I'd also be interested in hearing some comments on this.  A while ago,
when asked about single gas usage, I could've sworn JJ responded that
for shorter dives in the <50m range, O2 would be the choice.  I always
found that curious since JJ and G seem to try and clear out their deco
as early as possible, which would indicate 50/50 would be the better
choice.  Then when trying to find the message I was thinking of, I
stumbled across this post from JJ:

> If I were to be using one bottle it would be the 50. Depending on the dive
> I may carry two small bottles which I do a lot. On occaision we do the 50%
> on the first dive and if its a repet we would do the 50 and then both on
> the second dive. 

And then G replied:

> JJ will answer , but he and I always choose the deep stops over the
> shallow, and having the better gas deep is not only in keeping with
> getting that part done right, it conforms to our experience. Most of my
> ocean dives are one gas dives - I do not generally see the need for the
> oxygen at all on a short hop first dive, and prefer not to take the
> beating of using it for not reason. On the second dive, I would take
> both gases. The oxygen window explanation is the correct one in this
> context of doing the deeper stops as well. 

But like Simon, I assumed that for a shortish, shallowish dive, O2 would
be the better choice for many of the reasons in the Baker's Dozen.

Lest I be smote, I hasten to add I'm not in any way trying to impune G's
experience/knowledge, I would just like a clarification on what the
"best" single gas to use would be for a shallowish (<=50m) shortish (say
<= 30min) dive.

Thanks,
Dave

Simon Murray wrote:

> I would be interested in the feedback of any other people as to choosing to
use 50% from
> 21m instead of o2 as a deco gas on shallower (say up to 50m) dives.
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