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Office of Coast Survey (OCS)
This maritime site features downloadable navigational charts, historic maps and charts from the late 1700s to present day, access to the Automated Wreck and Obstruction Information System (AWOIS), and related publications. The "NowCoast" service is a portal to U.S. coastal data, observations, and forecasts. From the National Oceanic and Atmospheric Administration (NOAA).
http://chartmaker.ncd.noaa.gov/
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