navigational aid meaning in Chinese

导航设备

Lighthouse mechanic and navigational aids attendant grades
灯塔机匠及辅航服务员
It is impossible to navigate safely without these navigational aids
如果没有这些助航设备，安全航行是不可能的。
These virtual folders serve only as organizational and navigational aids
这些虚拟文件夹仅仅起到组织和定位的作用。
Not having proper navigational aids the pilot had been unaware of the changing conditions and had flown the plane right into the eye of the tropical storm
由于没有适当的导航援助，飞行员不了解周围气候的变化情况，将飞机直接飞入了热带飓风眼内。
Online manual on map reading and land navigation based on us army training materials which includes instructions on maps , compasses and other navigational aids
地图基于训练在地图，指南针和另外的航行帮助上包括指令的材料的美国军队读和陆地航行上的联机手册。

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