P,

Heathkit it back:


http://www.heathkit.com/index.php?option=com_content&view=article&id=120&Itemid=233


Jack Beale


Cool! Didn't know they were still around. And still in Benton
Harbor, too!

...that garage parking assistant looks a lot like one of the
circuits I built in their HERO robot years ago!

Harley

That could probably be used as an altitude gauge to help grease a
landing.  I remember some discussion about using a back up clearance
device similar to this for that same application.  If I recall there was
someone who flight tested this.

Mark LaPierre