And the world has more than 100 countries and areanavigation.
已和世界100多个国家和地区通航。
2
Secondly, this thesis investigates the designing methods for VOR/DME-based areanavigation flight procedure (RNAV FP).
其次，研究了基于VOR/DME导航台的区域导航飞行程序的设计方法；
3
FMS whose key questions are generation and realization of optimum flight trajectories are synthesized by areanavigation systems and performance management systems.