What is PBN (performance based navigation)?

• A. A scale of measuring how accurate GNSS is
• B. A scale of how aircraft performance is in different meteorological conditions
• C. A scale of radio navigation accuracy
• D. A scale of aircraft instrumentation accuracy

Answer: (A)

PBN centers on what the aircraft’s navigation system must achieve in terms performance—how accurately it can determine position and follow a path, with requirements for accuracy, integrity, continuity, and availability. It isn’t tied to a single radio aid and isn’t about weather effects or general instrument accuracy; it’s about meeting defined navigation performance standards. Because GNSS is typically used as the main reference to meet those standards, describing PBN as a scale of how accurate GNSS is aligns with the idea that PBN measures the capability of the navigation system to deliver the required performance.