The Seat Mount for Garmin GPS Devices attached to the front bolts of your seat rail to allow you to have a mounting option that isn't attached to your dash or windshield. 
With muliple joints and pivot point this allows you to dial in the location of your device.

This is a great options for vehicles with a smaller windshield, smaller dash or if you're looking to mount an Alpha XL, Alpha Handheld or Drivetrack without creating more blindspots.