RjL wrote:
Geez - what could be simpler than tracking an airway by VOR navigation? Is
following the little magenta line really easier than "needle left, fly left"
?

Yes, because there's no interpolation. The GPS also gives you your
ground track and desired track. You get on the line and match the
numbers. All GPS's also tell you how far off the line you are to a
precision not needed for even IFR flight. Mine goes to the hundredth of
a mile, 53 feet.