John Clonts wrote:
Have you ever flown a plane with OBS's that were designed where you
couldn't see most of the numbers around the
perimeter of it?

Yes, that's one kind I referred to. In fact, I once had to train a
student whose airplane was so equipped. I believe his CDI's were
Garmin and some model of Narco, but I could be wrong.

There are also others (Terra, Bendix 2000) that are digital - you dial
in the radial on a display rather than have a mechanical ring.

Michael