- Australian Hydrographic Office
 - Includes notices to mariners, copyright and licensing details, and general information about hydrography. - Degree Confluence Project
- 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.
- Galileo Global Navigational Satellite System
- European Space Agency project to launch a series of satellites in order to create a global navigation and positioning system for civil purposes.
- John Harrison and the Longitude Problem
- 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.
 Natural Navigator, The
- School specialising in training and research in natural navigation.- NOVA: Lost at Sea - The Search for Longitude
- 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.
- Royal Institute of Navigation
- Research institute devoted to expanding the study of navigation in a variety of forms (astronomy, mathematics, cartography, electronics and information technology) and to further its development.
- U.S. Coast Guard Navigation Center
- Provides worldwide users with reliable navigation signals, timely operational status, general navigation, and other information.
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