Is it possible to land a plane only with the Garmin® Synthetic Vision?
Apparently yes, according to this 2008 review of the system in a Diamond DA40:


  With [a safety pilot], I stayed under
  the hood for the entire flight—takeoff, en route, approach and
  landing—using the system’s visual cues. I managed to land the airplane
  without breaking anything, barely. It wasn’t pretty, but it
  demonstrated what was possible.