About: http://webisa.webdatacommons.org/61606397

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	Thus, such underwater position reference systems are either expensive, have very shot lives, or require frequent resetting or checking from another station such as a surface ship or the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com