This AutoPilotLight Version is a stand-alone HUD Application. It works with the embedded GPS of your mobile device and displays the speed in km/h or mph with Head Up Display technology on the windscreen of the car.
Simply without any additional devices. You can use that app universal on iPhone6, iPhone7, iPadPro 2th, iPadPro 3th etc.
The only thing you need is a HUD foil.