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Wikipedia definition
1. Area navigationArea Navigation (RNAV) is a method of Instrument Flight Rules (IFR) navigation that allows an aircraft to choose any course within a network of navigation beacons, rather than navigating directly to and from the beacons. This can conserve flight distance, reduce congestion, and allow flights into airports without beacons. Area navigation used to be called Random Navigation and therefore the acronym is RNAV .
Read “Area navigation” on English Wikipedia
Read “広域航法” on Japanese Wikipedia
Read “Area navigation” on DBpedia

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