RNAVGNSS

RNAVGNSS is a navigation specification used in civil aviation that relies on Global Navigation Satellite System signals as the primary means of determining an aircraft's position for RNAV operations. It enables aircraft to fly accurate, predefined routes and instrument procedures using GNSS-derived position data, without requiring traditional ground-based navaids.

Equipment and methods required for RNAVGNSS include an IFR-certified GNSS receiver, flight management or navigation computers to process position and guidance data, and typically augmentation such as SBAS (for example WAAS or EGNOS) or GBAS to improve accuracy, integrity, and availability. In some cases, inertial sensors provide continuity during brief GNSS outages.

Applications and performance characteristics of RNAVGNSS cover en route navigation, terminal area procedures, and RNAV-based approaches. Lateral performance is commonly described using RNAV accuracy categories such as RNAV 1 or RNAV 2, reflecting required navigation performance along a route. Some operations also employ performance-based navigation with RNP values (for example RNP 0.3 or smaller). Vertical guidance may be provided through LPV approaches via SBAS, or LNAV/VNAV solutions that couple GNSS with barometric systems in certain procedures.

Regulatory context and significance: ICAO and many national authorities recognize RNAV (GNSS) as a core element of performance-based navigation. It reduces reliance on ground-based navaids, enabling more direct routing, greater airspace efficiency, and expanded access to airports. Limitations include susceptibility to GNSS outages or interference, necessitating redundancy, integrity monitoring, and, when required, alternative navigation capabilities to maintain safe operations.