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 Issues: 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.
The Complete On-Board Celestial Navigator - About a reference book for navigation at sea. Includes table of contents and purchasing information.
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.
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