Andrew Sarangan writes:

This is like the remark from non-aviators why we still use the archaic
units of nautical miles and knots.

That is a different issue. Nautical miles and knots are stable and
need not be changed because aviation is effectively isolated from
other domains in which units of measure are required. In contrast,
magnetic poles move, and magnetic compasses depend on a magnetic field
that not only moves on its own throughout the planet but is also
distorted locally and regionally.

I have no problem with using nm and kts in aviation, or even with
using pounds for fuel, as long as everyone is on the same page.
Trying to switch units has sometimes had tragic results.

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