单项选择题
In particular,which is not included in the Navigation System?（）
A.ECDIS B.RADAR C.GPS D.GMDSS
单项选择题 The VDR system is designed to operate（）once it is set up correctly.There is no user interaction.
单项选择题 Information from the stations and installations shall be appropriatelysharedby（）.
单项选择题 The only cylindrical chart projection widely used for navigation is the（）.
