you do one then the other
example, I'm at 500 ft at 80°, I go to big bear at 7000 ft at 60°
for -20° you'll drop from a 150 to a 147.5
so you would need to shift the scale to read 147.5 on the altitude scale.
for 7000 ft you drop from a 147.5 to a 137.5
that's of course you're racing around big bear.
if you're going to big bear, you just go.
F the jets.