About: http://webisa.webdatacommons.org/359210641

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 most cases this is achieved by a system of written and/or radioed Notices to Mariners, available to all merchantmen and to the International Maritime Organization.
http://www.w3.org/ns/prov#wasQuotedFrom	usni.org