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.
Plain English
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.
Context Anchor
Seen in instrument navigation discussions, route descriptions, and charts that show the required navigation accuracy for a segment of flight.
Derivation
Required Navigation Performance means exactly what it says: the level of navigation accuracy required for that piece of airspace. The number 2.0 is the allowed lateral error in nautical miles. So RNP 2.0 = 'you must be able to navigate within 2 NM of track.'
Why Pilots Care
Determines whether an aircraft is eligible to fly certain RNAV routes and approaches that have tighter navigation tolerances.
Analogy
Like a car that must stay inside a two-mile-wide invisible lane using only its own instruments, without drifting outside the boundaries.
Grounding Statement
Think of RNP 2.0 as a required navigation accuracy limit: the aircraft must be able to stay close enough to the intended path, within 2.0 nautical miles most of the time.
Intuition Check
RNP 2.0 is not a version number or software label. The “2.0” means 2.0 nautical miles of required navigation accuracy.
Example Sentence 1
The route across the Gulf of Mexico required RNP 2.0, so we confirmed the GPS was operating normally before crossing the coast.
Example Sentence 2
Before accepting the clearance, the crew confirmed the navigation system met RNP 2.0 requirements.