(AU)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.
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.
U.S. Coast Guard Navigation Center - Provides worldwide users with reliable navigation signals, timely operational status, general navigation, and other information.
