途经美国水域的船舶必须携带海图，以用于计划预定航路。
Ships transiting U.S. waters are required to carry nautical charts, which they use to plan their routes for intended voyages.
该局最近还完成了靠近北极湾城的纳尼西维克区域的海图绘制工作，有计划在那里建立一个军事深海港口。
The service also recently completed charting work in the Nanisivik area near Arctic Bay, where there are plans to build a military deep sea port.
海图和航海出版物，用于计划和显示船舶预定航程的航线以及监测整个航程的船位。
4 nautical charts and nautical publications to plan and display the ship's route for the intended voyage and to plot and monitor positions throughout the voyage.
海图和航海出版物，用于计划和显示船舶预定航程的航线以及监测整个航程的船位。
4 nautical charts and nautical publications to plan and display the ship's route for the intended voyage and to plot and monitor positions throughout the voyage.
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