"Richard Hertz" wrote
As for the actual headings and altitudes - just think about the sort
of pattern the controllers normally use, and call the headings and
altitudes. If you need to, practice with little toy airplanes and
charts. A handheld GPS is great for 'cheating' especially at night or
if the terrain is featureless. Besides, if you're going to instruct
in actual you need one anyway.

Huh? care to explain that?

Well, if you're instructing in actual in the typical light GA
airplane, you're depending on the continued performance of a
non-redundant electrical system with a mostly unknown maintenance
history. Do you really want to risk your neck that way?

Carrying a handheld battery powered GPS means you retain the ability
to shoot most non-precision approaches in an emergency. I know people
who have had to do that.

Michael