d Should I carry oxygen for 10,500ft?

It is not required by regs. I do not use oxygen at that altitude.
However, some people have reported, especially at night, diminished
performance at that altitude (in fact, even above five thousand). I
haven't done it (mainly because I don't have one) but I'd like to take
one of those pulse oximeters up to altitude and see what -=my=-
physiology is. Everyone's is different (and it may vary from day to day)

Has anyone done this who's willing to post results and circumstances?

Jose
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