About: http://webisa.webdatacommons.org/193796780

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	GPS and other satellite navigation systems enable a determination of one's position and velocity speedily, accurately, automatically, and inexpensively.
http://www.w3.org/ns/prov#wasQuotedFrom	leapsecond.com