Here we provide links to a number of other information sources on astro navigation (or celestial navigation), sextants, and training courses.
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Astro Navigation
Wikipedia on Celestial Navigation
Celestial Navigation Net - a site on the history, theory and practice of astro navigation
National Maritime Museum - astro navigation items through history
China Culture Celestial Navigation - a brief article on China's history of astro navigation
The Navigation Foundation - dedicated to preserving astro navigation and related skills
Sextants
Wikipedia on Sextants
Astra - a good value aluminium sextant made in China in a joint venture with Celestaire
Cassens & Plath - a range of high quality sextants for yachtsmen and commercial mariners
Davis - a range of quality plastic sextants for those on a budget
Freiberger - high quality German aluminium sextants
Tamaya - high quality Japanese aluminium sextants
The Antique Sextant - a range of reproduction sextants, largely based on models from Stanley & Co, London
Training
RYA Yachtmaster Ocean - British astro navigation qualifications
Celestial Navigation Standard - Canadian Yachting Association standards for sextant navigation
Celestial Navigation Certification - US Sailing syllabus for celestial navigation
Astro at Sea - a very popular course run by Stokey Woodall, probably Britain's most enthusiastic proponent of astro navigation
Ocean Training - distance learning course for the RYA Yachtmaster Ocean
RYA Yachtmaster Ocean - learn astro as part of the syllabus
General
BoatingLinks.com Web Directory, find what you're looking for!
OnPassage.com - Onpassage.com is a one-stop resource for cruising yachts worldwide.
Sealogy - Italian marine web directory