The number of GPS satellites that the GPS navigator can receive and its path planning ability are key to determining the quality of the GPS navigator. The more effective satellites the navigator can receive, the stronger its current signal and the more stable the navigation operation. If a navigator often fails to search for satellites or frequently interrupts signals during the navigation process, which affects normal navigation work, then its quality is not good, let alone good or bad.

　　Secondly, the planning ability of the path is also important. An excellent navigator should be able to quickly and accurately indicate a path with the shortest time or distance (according to personal preferences) based on the current parking space and the user's designated destination. The path arrangement should be user-friendly, and it is safe and comfortable to drive without detours. The ability to plan paths is not only related to processors and software, but also to maps. As mentioned earlier, a map is equivalent to a database, and the more comprehensive and up-to-date the data inside, the more reasonable the route designed by the navigator. Therefore, the level of map detail and the ability to update in a timely manner also have a crucial impact on the quality of the navigator.

　　There are various types of GPS car navigation devices, including built-in DVD system navigation devices, external portable car navigation devices, handheld PDA mobile navigation devices, and Bluetooth GPS receiver modules. Based on our evaluation of external portable car navigation devices, how can they be considered qualified car GPS?

　　As the name suggests, in car GPS must be placed inside the car, so it needs a bracket that can rotate freely and has strong chassis adsorption capacity; A screen with excellent display effect and the ability to clearly see map instructions; For the sake of driving safety, we cannot always stare at the screen, and at this time, the voice prompt function with loud and timely broadcasting becomes very important; Moreover, the range of the navigator is generally limited, and we urgently need a car charger with a cigarette lighter interface that can charge the device over long distances. These are all necessary conditions for qualified on-board GPS that are related to the characteristics of automobiles. In addition, the satellite reception capability, software road calculation capability, map accuracy and updating capability mentioned earlier are the working foundations of the navigation system, and cannot be ignored

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