" Like AM radio, magnetic headings are still with us, even though
navigation in general has advanced by leaps and bounds. When will
true headings be used? The magnetic poles are in continuous motion;
the rotational poles are stable.

There is one, and ONLY one instrument in the aircraft that does not require
a power source or have a common catastrophic failure mode. The sucker will
work and get you home even after it has poured a few tablespoons of kerosene
all over the instrument panel.




Eventually, the magnetic poles will move so far that every station and
aircraft everywhere will have to be recalibrated to account for it,
and all charts will have to be changed. And the poles occasionally
reverse, which would also be somewhat of a disaster for
magnetically-based aviation.

Charts are in constant revision for magnetic pole movement. Runway numbers
are reassigned and painted on a regular basis. We can take a pole reversal
and in a week's time have a method of compensating for it.

Why are you posing these old chestnuts here? Can't you google on past
discussions on the matter(s)?

Jim