- Degree Confluence Project -
- Navigation Information Connection (NIC) - emphasis on inland river/waterway transportation.
- John Harrison and the Longitude Problem - the story behind the manufacture of Harrison's marine timekeepers, and some notes about Harrison and the timekeepers themselves, presented by the Royal Observatory Greenwich.
- NOVA: Lost at Sea - The Search for Longitude - The Search for Longitude
- U.S. Coast Guard Navigation Center - provides worldwide users with reliable navigation signals, timely operational status, general navigation, and other information.
- Global Navigation Satellite System (GLONASS) Information -
- Galileo - European Space Agency project to launch a series of satellites in order to create a global navigation and positioning system for civil purposes.
- Australian Hydrographic Office - includes notices to mariners, copyright and licensing details, and general information about hydrography.
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