Andrew Sarangan wrote:
That means you are not using the CDI to its full potential. A CDI gives
a _course_ to turn to, not a left/right indication. For that to work,
you need a full circle of numbers around the CDI.
If you have never encoutered this concept before, you should read this:
http://www.sarangan.org/aviation/art...or-article.pdf

The methods in this article seem to me to be just how HSIs are used (or
should be used) and is analogous to having a course line on a moving
map page. When teaching the method, its my experience that it is better
understood by using a VOR head with CDIs that stay parallel as they
deflect, rather than the ones hinged on top in the article. Its a minor
point, but then you can explain it as a map (not to scale) showing the
course line with respect to the airplane. On an HSI, the map would be
oriented "heading up," whereas on a VOR head it is "course up." This
also helps people transition to HSIs as well.

Peter