Tag: Pilotage

The Earth Science text book

The Earth Science text book has a nice interactive site. Imagine that you had a sailboat available for your use and you were asked to…

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Sextants as a backup ;-)

GPS is wonderful. World-wide coverage and reasonably priced receivers (both installed and handheld) contribute to maritime safety through accurate positioning of vessels. Yet, some back-up…

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HMNAO also produces astronomical data suitable for a wide range of users, including professional and amateur astronomers, mariners, aviators, surveyors, the armed forces, lawyers, religious…

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