I have been real happy with my Magellan Meridian Platinum.

It worked well on the Concorde. The downside is that the speedometer did not work beyond 999 mph. - or at least I did not know how to expand the field.

Nothing like looking out the window and knowing exactly where you are. A short while back on a flight back from San Diego I was able to follow some back roads I took in the Four Corners region. It has been two years too long since I have been there.