Sail with ancient Polynesian navigators

A recent trip to Hawaii piqued my curiosity ancient about Polynesian sailors. They didn't have written math or language, or western instruments like compasses or clocks. So how did they navigate across vast open oceans without 'modern' technology?
Watch how in Sanford Low's wonderful 2013 documentary, 'The Navigators: Pathfinders of the Pacific. — Read the rest
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