No, never went to Sion. My masters preferred St. Moritz. As I recall temp correction only became available on Honeywell’s after I went on the G650. Can barely remember to check the tyres on my Zimmer frame these days let alone what I did 7 years ago.
My point was the irony of requiring us to calculate Density Height to the nearest inch all the while ignoring the existence of the large altimeter errors induced by extreme cold weather within the syllabus of the Senior Comm theory in my era. Made all the more delicious when it was just now revealed that the chap setting the syllabus at that time was a navigator with polar experience.
As my old mate Rummy used to say, “there are unknown unknowns”. You’re 100% correct, it behooves us all to minimise their numbers. Curiosity may have killed the cat, but it never killed a pilot.