1. Space part

　　The GPS space is composed of 24 satellites. It is located over 20200km from the surface of the ground, with a operating cycle of 12h. The satellites are evenly distributed on the 6 orbit surface, and the orbital inclination angle is 55 °. The distribution of satellites allows more than 4 satellites to observe more than 4 satellites around the world, and can pre -store navigation information in the satellite. The GPS satellite due to atmospheric friction and other issues. reduce.

　　2. Steering voice prompt

　　As long as the vehicle encounters an intersection or turning in front, the vehicle GPS voice system prompts the user to turn the voice prompts. This can avoid car owners from taking detours. It can provide a full -range voice reminder. Drivers can achieve the entire process of navigation without observing the display interface, making driving more secure and comfortable.

　　3. Show the track

　　The GPS has a track record function, which can record the route of the user's vehicle through, the accuracy of less than 10 meters, and even the difference between the two lanes. Users can start its return function and find the route home.

　　4. Speed measurement

　　Through the GPS reception of satellite signals, the specific speed of driving can be calculated, which is much more accurate than the general mileage table

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