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  • Degree Confluence Project Open site in a new window - Aims to visit each of the latitude and longitude integer degree intersections in the world, and to take at least one picture at each location.
  • U.S. Coast Guard Navigation Center Open site in a new window - Provides worldwide users with reliable navigation signals, timely operational status, general navigation, and other information.
  • Australian Hydrographic Office Open site in a new window - Includes notices to mariners, copyright and licensing details, and general information about hydrography.
  • Galileo Global Navigational Satellite System Open site in a new window - European Space Agency project to launch a series of satellites in order to create a global navigation and positioning system for civil purposes.
  • NOVA: Lost at Sea - The Search for Longitude Open site in a new window - Companion to the PBS special about the quest for a method of determining a seafaring ship's longitude. Learn why ocean navigation depends on knowing what time it is.
  • John Harrison and the Longitude Problem Open site in a new window - The story behind the manufacture of John Harrison's marine timekeepers, which allowed early sailors to establish their longitude. Presented by the Royal Observatory in Greenwich.
 



 
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