Hi, this is my first post. So be patient with me because is quite difficult to write in english when you're from South America.

I have a similar with 737 and 727, i don't know why i can't just switch from nav to gps. When i press the button for a 0.0001 seconds it switch to gps and then go back to nav mode again, is the same thing when i use the toggle (Shift+N) this happens with the 737. The 727 is another history, i know that this planes were designed to fly vor-vor but for me sometimes i only wants to put the autopilot an then relax

Greetings from Colombia