Obviously the foundation of electronic navigation system can not meet this need, So human envisaged the possibility of radio transmitting stations on the air.
显然地基电子导航系统不能满足这种需要，于是人类就设想是否可以将无线电发射参考站建立在空中。
Now, in many parts of the world, when you hire a car, you get a navigation system — a little electronic map on a screen with a machine voice.
目前在世界的许多地方，你在租用汽车时都会获得一个导航系统，它是显示在屏幕上的一张小型电子地图，可以发出机器声音。
The smart displays provide navigation and collision avoidance visualization from the radar sources and are used together with the Electronic Chart Display and Information System-Navy (ECDIS-N).
智能显示器通过雷达信号提供导航服务并接收防撞信息，同时，该显示器还可以与海军电子图显示和信息系统（ECDIS-N）一同使用。
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