WIFI GPS

　　Wifi positioning, as the name implies, there must be wifi around it! The purpose of WiFi positioning is to solve indoor accurate positioning, the principle is similar to **** positioning. The conditions for WiFi positioning are as follows :1. wifi must be enabled, regardless of whether it is connected to a hotspot. 2. You must have access to the Internet, either mobile data or wifi.

　　Principle: Each wireless AP has a unique MAC address in the world. WiFi positioning relies on detecting the MAC addresses of all nearby WiFi Access points, comparing the coordinates of the MAC addresses in the database, and cross-calculating the location.

　　Advantages :1. High positioning accuracy, very accurate where wifi is dense and there are many people; 2, fast speed; 3, even if the surrounding wifi is not connected, it can also locate. Without relying on external devices, there is no more accurate indoor positioning method than WIFI positioning. Indoor positioning is not accurate, and it is 20 or 30 meters away. Current technology has no solution to this problem.

　　Cons: Obvious, 1. wifi dependency! -- Unable to locate without turning on wifi; 2. Must be connected to the Internet. 3. Users are forced to share a bit of traffic

　　Accuracy :10~200 meters

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