GPS has been in civilian life for some time. In today's China, we ordinary people can enjoy the contributions made by the U.S. government to people all over the world with peace of mind. In addition to the WAAS system can not enjoy, the other is satisfactory. WAAS is a GPS signal differential correction system based on ground stations that only covers North America, which enables the accuracy of GPS signals to reach 0.5-3 meters. However, in China, I have received 10 stars in places where the terrain is relatively wide, and the measurement accuracy has reached 4-5 meters, which is quite satisfactory.

　　Here, I want to talk about how to use the GPS receiver pragmatically.

　　At present, there are many kinds of GPS receivers on the market, generally there are several application modes such as hand-held, vehicle-mounted, and receiver+PDA. I often see many GPS enthusiast forums discussing which device is better, which map is the most useful, and so on. Below, I will talk about the essence of GPS receiver use from the actual use experience.

　　If it is an in-vehicle application, then the situation is quite simple. As long as you don't care about spending money, both in-vehicle and PDA applications are fine. Because the car is a small room, in terms of energy, the power supply can be said to be endless for such a small device. The use environment is basically equivalent to the indoor (In Door), as long as you have the money, you can do everything in luxury - even connect a laptop. But if we are hiking in the wild, we have to consider many other issues when choosing and using GPS systems.

　　The most fundamental role of a GPS receiver is to calculate the latitude and longitude of the current location by receiving satellite signals (through the Doppler effect of radio waves). The more signal sources the receiver receives at the same time and the more scattered the signal sources are in the airspace, the higher the positioning accuracy. But what's the use of just knowing your latitude and longitude? It has happened before: there are beginners hiking, carrying GPS systems, and entering no man's land. Thought that with GPS, everything is safe. As a result, when I got lost, when I turned on the GPS, the signal was really strong, the machine gave a pair of numbers, and the detailed road network map saved by the machine was also blank—the nearest navigation point is Lanzhou—isn’t it? There is no road there at all. A few thousand dollars of GPS has completely lost its reference value. As a result, the person escaped from danger by relying on the compass function provided by GPS. From this example, we can see that although GPS is advanced, it is useless if used improperly. With the person in distress in the example above, using GPS is fundamentally wrong - GPS doesn't tell you where to go.

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