About: http://webisa.webdatacommons.org/35248173

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	The reference station as claimed in claim 23 further comprising an alerting device for sending an alert to a location other than the positioning system when the position is equal to an alert position.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com