Bill Daniels wrote:

The only adjective I can use is that his flying was 'goofy'. While he
clearly understood what I wanted him to do, he could not perform to
standards. Finally, suspecting hypoxia, I had him wear my pulse oximeter.
His SpO2 was at 85% at 7000 feet ASL. He then confided in me that, as a
child, he had suffered a lung infection that had left him a bit 'short of
breath' but that he had never considered this very important.

I persuaded him to buy a Mountain High portable system with a small aluminum
bottle that he could wear around his neck. With O2, his flying instantly
improved to the point he got his US license.

He's not the only one. Pat McLaughlin of Mountain High told me when they
first began selling oximeters years ago, they got calls from a few
customers saying the oximeters read too low, even on the ground (like in
Florida). After having some oximeters returned that checked out
properly, Pat had these pilots get themselves to doctors for pulmonary
tests, which confirmed what the oximeters had reported.

--
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Eric Greenwell
Washington State
USA