About: http://webisa.webdatacommons.org/352377033

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	However, for a navigational system implemented using handheld devices such as cellular telephones, it is impractical to have the handheld devices connected to external sensors, especially when the device is used while walking.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com