Navigation Meets Projection in Garmin's First Portable Head-Up Display (HUD)
HUD is able to provide comprehensive road guidance at a glance and right within the driver's line of sight, which in theory should make for safer drivers compared to looking over to the side at a traditional GPS or down at a smartphone. Speaking of which, your smartphone is what provides HUD with navigation information from a Garmin StreetPilot or NAVIGON app via a Bluetooth connection.

The projection doesn't take up much space on the windshield, though it makes the most of its available space by displaying turn arrows, distance to the next turn, current speed, speed limit, and estimated time of arrival. It even tells drivers which lane to be in for the next turn.
HUD will be available sometime this summer for $130 MSRP. Garmin StreetPilot and NAVIGON apps start at $30.