electronic navigation chart display 电子海图
electronic navigation chart system 电子海图导航系统
3-D electronic navigation chart 三维电子海图
electronic chart navigation system 电子海图导航系统
electronic sea chart navigation systems 电子海图导航系统
Embedded electronic chart navigation system 嵌入式电子海图导航系统
Most countries of the world have paid highly attention to electronic charts and its application system. They have developed various products related to electronic navigation chart and made a big progress in type, function and technical performance of the charts.
世界各国对电子海图及其应用系统都极为重视，开发出各种电子海图产品，在种类、功能及技术性能方面都取得巨大进展。
参考来源 - 电子海图数据库及其索引技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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