However, both alone has some limitations, in order to enhance the safety of maritime navigation, it is necessary to radar images superimposed display on the electronic navigation chart.
但是两者单独使用有一定的局限性，为了更好的提高海上航行安全，实现雷达图像与电子海图叠加显示是必要的。
The rampant ACTS of Somalia pirates have caused a serious hazard to international shipping and the safety of maritime navigation, and it is a threat and damage to international peace and security.
索马里海盗的猖獗行为，对国际航运和海上航行安全构成了严重危害，是对国际和平及安全的威胁与破坏。
Maritime Navigation Aid System is an important part of Maritime Traffic Safety Guarantee System.
海上航标系统是海上交通安全保障体系的重要组成部分。
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