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Actually they changed long before that. If you know the
lat/lon of the origin and destination, you can write a
computer program that prints out the route, with waypoints
and headings at points every N miles along the route.
For that matter, nobody wants to navigate a great-circle route
exactly anyway. You take that as a rough basis, and then
fudge it left or right to pick up more-favorable winds, avoid
nasty weather, et cetera.