On Saturday, May 20, 2017 at 4:02:11 PM UTC-5, wrote:
On Friday, May 19, 2017 at 11:12:30 AM UTC-7, Frank Whiteley wrote:
Clarity well before landing after a long flight is good also.

That's why I go to night (100%) mode toward the end of the day.

-Tom

Tom, nothing wrong with that but..
Flying with my Mountain High system on long flights out West I do check O2 saturation occasionally with my finger-tip device. I',m always at 97-98%. Will 100% O2 mode get you above those numbers? I don't think so.
Herb