GPS navigation system

　　(1) User input destination. Before departure, the user inputs the destination into the navigation device through the input method provided by the system. In addition to directly clicking to select a location on the electronic map displayed in the system, more often than not, it is through some input method to input the destination name into the system.

　　(2) Driving route. The car navigation host obtains the calculated longitude and latitude of the current point from the GPS receiver, and can determine the current location of the vehicle at any time by comparing it with electronic map data. Generally, the Automotive navigation system defaults the current position of the vehicle as the starting point. After the user enters the destination, the navigation system can automatically calculate the most appropriate recommended route as a new driving route according to the map information stored on the electronic map.

　　(3) Navigation during driving. The output devices of the automotive automatic navigation system, including display screens and voice output devices. During the driving process, the driver must be fully focused on driving and cannot frequently view the display screen. Therefore, a practical and user-friendly vehicle automatic navigation system generally uses voice output to provide prompt information to the driver when necessary.

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