About: http://webisa.webdatacommons.org/281738744

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	Their objective is to measure a ships velocity with respect to the floor of the body of water and without reference to any land-based objects and without being influenced by wind and other adverse weather conditions.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com