It was around 1996 or thereabouts when Garmin started cranking out the GNC 300XL. This was a TSO C129(A1) IFR approach GPS navigator and as a bonus, it had a utilitarian moving map (of course, any panel map back then was utilitarian) and a built-in VHF comm radio. It had no VHF nav-strictly GPS. The GNC series was a clever idea and almost the perfect solution for backing up a traditional navcomm, or for more basic panels, it worked as the primary rig because of the built-in comm. The cheaper GNC 250XL had a VFR GPS and a simpler install. The GNC series sold like rush-hour coffee at Starbucks.