Method for calculating an augmented reality overlay for displaying a navigation route on an AR display unit, device for carrying out the method, motor vehicle and computer program

A device for displaying an augmented reality (AR) overlay of navigation routes of a vehicle in an immediate field of vision of a driver, comprising:

• an AR display unit;
• a navigation system for determining a navigation route to a destination;
• and
• a computer for generating the AR overlay;
• wherein
• the navigation system is configured designed to:
• recurrently determine a current position of the vehicle;
• determine, using the current position, whether at least one alternate route to the destination exists;
• wherein
• the computer is configured to:
• generate the AR overlay such that an indication of the at least one alternate route is overlaid on the AR display unit at least at a predefined first distance before a branch-off point;
• and to
• generate the AR overlay with an operating option for the driver of the vehicle to selectively overlay an alternate route overview of the at least one alternate route on the AR display unit, and to selectively allow the driver to switch back and forth between the alternate route overview of the at least one alternate route and at least one previous route overview of a previously determined navigation route;
• wherein
• the AR overlay is generated by the computer so that the alternate route overview and the previous route overview displayed on the AR display comprise the entire respective route at least from the current position to the destination.