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  • Recreation > Boating > Sailing > Education
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  • Bowditch Online
    Navigation course containing 38 chapters covering charts, radar, astronomy, and regulations. Glossary. Archives for the navigation mailing list.
  • Celestial Navigation Data
    Astronomical information necessary to plot navigational lines of position from observations of the altitudes of celestial bodies from the U.S. Naval Observatory.
  • Digital Navigation Publications
    Downloadable publications from the National Imagery and Mapping Agency including The American Practical Navigator and Radio Navigational Aids.
  • Navigate!
    A free online course in basic coastal navigation.
  • Navigation Information Connection
    Links and photos associated with the U.S. Inland Waterway System. Includes real time location and queue lists of towboats and barges operating on U.S. inland waterways.
  • Sailing Issues: Navigation Course
    Contains nine chapters covering piloting, plotting, navigation aids, and tides. Related equations and tables.
  • The Complete On-Board Celestial Navigator
    About a reference book for navigation at sea. Includes table of contents and purchasing information.
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