What should I know about the Head Up Display?
The Head-Up Display is one of our optional add-on features. It replaces the standard view of the map, and displays a large arrow for the turn instructions and some additional data on a dark background, so that it can be clearly visible when it is reflected from your car's front windshield.
All you then have to do is place the phone, with the screen facing up, in front of you on the dashboard of your car. A non-slip or rubberized mat or phone case is recommended to prevent the phone from moving around.
The image from the phone's screen will reflect from the windshield and give you clear navigation instructions in your line-of-sight, so you don't have to take your eyes off the road.

More detailed information about this feature can be found in the user guide: Head-Up Display article