navigational datum meaning in English

航行基准面

Was caused by biased navigational data
是因为受到短暂地磁干扰后
Besides os , with its vast and valuable map data , there are the uk hydrographic office ( which collects tidal and naval navigational data ) , the highways agency ( which collects traffic data ) and even the european centre for medium range weather forecasting
除了坐拥大量地图珍贵资料的全国地形测量局，还有收集潮汐和船只航行资料的英国航道测量事务所，收及交通资料的高速公路局，甚至欧洲中期气象预测中心。
With the development of a flight preparation assisting system as an example , this paper gives a detailed account of the techniques and method of using electronic chart in general aviation flight preparation , including geographical information , navigational data and how to set up a performance databank for different types of aircraft as well as air route preparation and how to make flight plans , etc . which can be used for reference for developers of related systems
摘要以一个飞行准备辅助系统的开发为例，详细介绍了电子航图在通用航空飞行准备中的应用技术和方法，包括地理信息、航行资料和机型性能数据库的建库技术以及航线准备、飞行计划制定方法等内容，可供相关系统的开发人员借鉴。