Ocean Navigator Magazine On Line - Subscription information. Highlights from the current issue. Navigation problems to solve.

Navigate! - A free online course in basic coastal navigation.

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.

Sailing Iusses: Navigation Course - Contains nine chapters covering piloting, plotting, navigation aids, and tides. Related equations and tables.

Digital Navigation Publications - Downloadable publications from the National Imagery and Mapping Agency including The American Practical Navigator and Radio Navigational Aids.

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.