Sam Spade writes:

For VFR flight plans LAT/LON has a huge advantage over published fixes
in many parts of the Western U.S., both to avoid restricted areas and
remain in valleys (ala Eastern California, most of Nevada, and other
states with similar topography.

I sometimes fix up user waypoints for precisely this reason. When you
can't fly at FL340, it's handy to be able to plan a route that avoids
really high terrain, but the official waypoints are sometimes too thin
on the ground to serve the purpose.

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