About: http://webisa.webdatacommons.org/239352911

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In the really early days of sailing, this involved an intimate knowledge of the heavens and clues derived from wind, waves, currents, clouds, sea birds and other natural phenomena.
http://www.w3.org/ns/prov#wasQuotedFrom	boatus.com