The car navigation is usually connected with the car DVD system in the vehicle. Some car DVD players have built-in GPS navigation system so that you can access the system directly on the players. Some of the players don't come with such a system, but they have a SD card slot for the use of GPS SD card which has preloaded maps.
In most occasions, the major function of a car GPS is to provide necessary geographic information for the driver. The monitor of a car DVD is often used to display a clear electronic map when you access the system. You can zoom in or out the map so as to get a better view of the image. The car navigation not only offer specific information like current street and city, but also show you details like direction to destination, distance to next change of direction, current speed, distance to destination, expected time of arrival at the destination and so on. In addition, the car GPS is also able to provide lane assistant as well as safety/speed cameras alerts, and tell you the strength of GPS signal.
Nowadays, many car DVD GPS players support 3D and 2D map views, which bring much better visual experience for people to see the map. Furthermore, you can find an address by postcode easily, and the unit can provide you with next turn instruction with voice guidance, which may enhance the security of the driving. Besides, the system can store and manage the routes of your points of interest and display them when you find them next time, so you can save much time.
All in all, the car GPS is a necessary unit in the vehicle to offer useful information of locations and routes. With such a unit, you don't have to worry about whether you will be lost in the crisscrossing traffic. Therefore, in general, it is regarded as a must when people plan to purchase a multifunctional car DVD player.
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