How does GPS work?

This video explores the technicalities of how Marine GPS units can calculate position wherever you are in the world.

In this video, GPS means the system developed by the USA called NAVSTAR GPS. Other Global Satellite Navigation Systems are available.

Read the article that this video is based on here: http://casualnavigation.com/marine-gps

GPS is used by merchant ships, navy ships and pleasure boats as a way on finding position at sea. As a navigator, it is important that you know how GPS actually calculates position so that you know when it is feeding you false information.

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