Is there a way to use the original nav screen but update to a garmin or any other company based system. I just don't want to spend $200 on an already 5 year old disc.

 

Not that I'm aware of. Frankly the factory nav does nothing for me - Google blow it away as you would expect. I usually just prop my phone up in front of the nav screen if I'm just doing short runs, and I have a tablet mount for when I'm actually wheeling.