Plain English Meaning
A rule that says the aircraft's navigation system must be able to keep the plane within 2 nautical miles of its planned route, almost all of the time, and warn the pilot if it can't.
Full Definition
A navigation specification requiring an aircraft to maintain its position within 2.0 nautical miles of the intended track for 95 percent of the total flight time, with onboard performance monitoring and alerting if that accuracy cannot be met. RNP 2.0 is typically used in oceanic and remote continental airspace.
Context Anchor
Seen in instrument navigation discussions, route descriptions, and that show the required navigation accuracy for a of .