Earlier, wrote:

Who remembers the red and green books?

Sorta off topic, but who remembers those awful speed-limited gates with
a pyramid sight, a finish gate and a speed gate? I worked one or two of
those at Minden in, what was it, early 1980s?

What with wind, altitude, and CAS/TAS/IAS conversions, it was a mess.
It seemed that nobody was sorry to see them eliminated.

Bob K.