A car GPS navigation system is a device that uses satellite signals to determine your location and provide directions to your desired destination while you are driving. It typically consists of a display screen, internal memory, GPS receiver, and mapping software.Car GPS navigation systems usually come with a preloaded map database that allows you to navigate to any location in the world. You can enter a specific address, intersection or point of interest, and the GPS will calculate the best route based on your current location and the road network. Some systems also provide real-time traffic updates to help you avoid congested areas and find the fastest route to your destination.