According to the design of network navigation system its function is implemented which a system is adapt to mobile device.
介绍了自主导航技术并提出了不足之处，设计了网络导航系统，实现了一个适合移动设备的网络导航服务系统应有的功能。
The function and acquirement of E-MAP, and the design and update technique of navigation database are also put forward in detail.
详细叙述了电子地图的作用、获取以及导航数据库的设计与更新技术。
The system comprises five function modules which are chart display, chart work, track design, track watching, navigation redisplay and print.
实现了海图显示、海图作业、航线设计、航路监视、航行再现以及打印五个功能。
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