"Everett M. Greene" wrote:

writes:
Icebound wrote::

a.. Navigation without magnetic compass: gyro errors, finding & using the
sun's true bearing, and finding true north without celestial reference.

What about FMS and IRUs? Been around on the more sophisticated airliners
since the 767 came out in 1982 or so.

There are all sorts of things for the big boys, but what
do the small planes use?

The question was asked in the general context of aviation, not just light
aircraft operations.