Still haven't read the reason, the impetus for changing out the 'system'.
I saw a flight department close because the chief pilot took months to change a GNS XL to a UNS1. He said the GNS was 'dangerous'.
Long before glass and GPS units, planes still went from Point A to B. Big surprise huh?
This thread lives and dies in the world of people wanting new toys in the cockpit and having such a lack of situational awareness that the only way they can fly comfortably is by following a little white airplane on a screen.