There are heads-up displays out there already that project things like speed or turn-by-turn directions on the windshield. Some of them come directly from the manufacturer, some of them are aftermarket add-ons, but none of them incorporate augmented reality like the upcoming Navion system from WayRay will.
Rather than throwing little left-turn arrows up in your field of vision, Navion projects holographic arrows that follow the road in front of you and then onto the road where you need to turn left. There’s no need to look at the navigation screen in the center console to figure out if the robot voice who pronounces everything wrong is telling you to take this left coming up right now or the next one. Navion will just run those green arrows along the correct path right in front of your eyeballs. No headset required.