About: http://webisa.webdatacommons.org/81900867

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 some case, especially with the 5883, the mag must be calibrated otherwise, the direction is not good.
http://www.w3.org/ns/prov#wasQuotedFrom	rcgroups.com