1. GPS cannot locate 100%, let alone believe the nonsense of indoor positioning. Unlike mobile phone broadcasting, GPS can receive signals everywhere, and many things will affect GPS reception, including the distribution status of sky stars, buildings, Viaduct, radio waves, leaves, thermal insulation paper, etc. There are too many things that will affect. Generally speaking, the area of the sky that can be seen from the GPS position is the area that gps can receive signals.

　　2. Do not use it once or twice, or for a day or two, to determine the quality of GPS - due to the different satellite states in the sky every day, perhaps the same place may receive full data in the morning, but cannot locate at night. It is possible that the positioning condition may not be good for several days in a row.

　　3. To compare the quality of GPS, it is necessary to compare it at the same time and in the same location. Many people who buy a new GPS will say that the one I used before is better, but this is incorrect because the final result is much different due to different usage times and locations. It is necessary to use it for a long time or at the same time and in the same place to feel the differences between the two types of GPS.

　　4. GPS reception intensity table is no longer sufficient as a reference for GPS purchase - when buying GPS, people only look at the reception table in the electronic map, which may have been quite accurate in the past. However, GPS, in order to make the reception table look good, there are fake signals or simulated signals, etc. The reception table is indeed very beautiful, but perhaps the positioning is not accurate, or even cannot be displayed correctly.

　　5. There is no GPS for indoor positioning - basically, if there is no signal indoors, it means there is no signal. Real indoor positioning starts from the cold start, but if it can be located, it is true indoor positioning. However, indoor positioning is basically meaningless because I cannot navigate at home.

　　6. To purchase GPS, you don't need to choose the manufacturer's brand as the purchase option, but you can choose chips for internal use. Basically, there are many manufacturers who make GPS, and choosing a manufacturer is only about after-sales service. It's not necessarily best for large manufacturers to receive signals. Generally speaking, for GPS with the same chip, different manufacturers will not have significant differences in effectiveness. Therefore, when choosing GPS, you can choose a GPS receiver chip instead of a manufacturer's brand.

　　7. Should I use Bluetooth, CF GPS, or GPS mouse- Generally speaking, this is a matter of opinion. When using Bluetooth or CF, one must worry about the issue of GPS or PDA running out of power at any time, and the cost is high. However, it can be navigated anytime and anywhere. Using GPS mouse is economical and has good reception, and there is no need to worry about power issues, but it is difficult to use wired.

　　The selection of cables should also be based on reducing reflection to ensure impedance matching

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