GPS navigation is the device which can help users to position the accurate present location and calculate the itinerary based on the given destination, and then leads the users to the destination by the map showing and audio prompt. Now the GPs navigations are widely applied in the traffic, tourism, and military and so on. Generally we talk about the car GPS.The operation of the GPS navigations relies on the GPS which is short for the Global Positioning System. The GPS system is comprised of the satellite in space, surface-monitoring and subscribers’ access. The GPS system is designed for the military purpose at first. But now it’s not limited in the military field, but expanded to the car navigation, atmosphere watch, geodetic survey, sea rescue and manned spacecraft detection.In addition, the car navigation system is required for the operation of the GPS navigation. The GPS navigation can only receive the data from the GPS satellite and calculate the information of the location, direction, running speed and time of users, but is not capable to calculate the route. In order to realize the route navigation, it requires the car navigation system including the hardware equipment, electronic map and navigation software.In conclusion, a whole GPS navigation is comprised of the chip, antenna, processor, RAM, screen, speaker, key-press, expandable socket and map navigation software. The more the satellite the GPS navigation receive, the strong the signal getting and the steadier navigation is developed. The basic functions of the GPS navigation are as follows:The map search. You can search the location of your destination on the operation terminal. You can record and save the location information of your destination. You can also share the information with others. It can help you check the information about the gas station, hotel and cash machine around you or around other objects.The route planning. The GPS navigation system will automatically plan a route according to your given starting point and destination. You can settle some approach points when you plan the route. Also you can set up to avoid the high speed.The audio navigation. The driver will be informed the driving information by the means of voice beforehand. Just like a guide tell you how to drive to your destination. It’s the most important function that you can arrive at the destination without observing the operation terminal. The image navigation. The map will be displayed on the operation terminal. And the present location of the car, the speed, the distance to the destination, the planned prompt route and the driving information can also be displayed. Replanning the route. If you failed to drive as the planned route or go wrong, the GPS navigation can replan a new route to your destination for you.Due to the convenience and the applicability, the GPS navigation is widely accepted and followed by the consumers since the GPS navigation is applied in the car field. With the large needs of the GPS navigations on the market, the GPS navigations are developed on the super highway.