If you want an ENC or a raster chart of an area within the US Economic Exclusion Zone, you can log on and download it. You will receive chart updates as they become available and no is money involved. It's as simple as that. When Thomas Jefferson founded the Office of Coast Survey back in 1807 he established a principle that has been maintained ever since. He recognised the importance of safe navigation to his country and he created a service that has evolved into the National Oceanic and Atmospheric Administration (NOAA).
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机译：如果要获得美国经济禁区内某个区域的ENC或栅格图，可以登录并下载。您将收到图表更新，因为它们可用，并且不涉及任何金钱。就这么简单。托马斯·杰斐逊（Thomas Jefferson）于1807年成立海岸测量局（Office of Coast Survey）时，就确立了一项原则，此原则一直保持至今。他认识到安全航行对他的国家的重要性，并创建了一项服务，现已发展为美国国家海洋和大气管理局（NOAA）。
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