About: http://webisa.webdatacommons.org/46270765

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	Navigation and guidance was done visually with aids such as maps and a sextant to determine initial flight direction.
http://www.w3.org/ns/prov#wasQuotedFrom	astronautix.com