The map database of the car navigation system comes from a variety of channels. The most important source in the meantime is the supplied block database. For a good in-vehicle navigation system, the quantity, accuracy, and timeliness of maps are all important. No matter how accurate the coordinate position provided by GPS is, if your navigation system cannot provide maps of your place or area, or the maps provided are faulty, your system can be said to be worthless. Therefore, when purchasing a car satellite navigation system, pay attention to the following:

First, check the accuracy of the test system. Pick one or two road sections you know, or a newly opened hotel, and see if the system can accurately show the location of the car. Since streets and roads are constantly changing, your system must also provide regular updates.

Second, consider the storage capacity of the system.

Third, the picture appears. The picture of the car navigation system appears, which can be mounted on the driving dashboard of a car, or can be projected on the screen of a laptop computer or a palm computer. In order to get used to different weather and light conditions, there must be sufficient brightness under the picture display screen, as well as sufficient size and good resolution.