RNAV2

RNAV2 is a navigation specification within the ICAO framework for area navigation (RNAV). It defines a lateral navigation performance standard that allows an aircraft to follow routes with a typical allowable lateral deviation of about 2 nautical miles from the intended path for a specified percentage of flight time. In practice, RNAV2 enables navigation along defined trajectories without sole reliance on ground-based navaids, supporting more flexible routing and improved airspace efficiency.

Applications and scope vary by region, but RNAV2 is commonly used for en-route segments and certain terminal procedures where a moderate level of lateral accuracy is sufficient. It sits between RNAV1 and RNAV5 in terms of permitted lateral error, providing a balance between precision and operational flexibility. Some procedures and areas may designate RNAV2 as an RNP with specific on-board performance monitoring requirements, while others may operate RNAV2 without the full RNP equipment mandates.

Equipment and operational considerations: RNAV2 operations typically require aircraft navigation equipment capable of computing position and track from GNSS or other RNAV sensors. In many jurisdictions, approval to conduct RNAV2 procedures rests with the national aviation authority and may depend on maintenance of navigation databases, sensor integrity, and pilot procedures. If designated as RNP2, on-board navigation performance monitoring and alerting compliance are required.

Relation to RNP: RNAV2 is part of the RNAV family, describing lateral performance. RNP2 is a closely related specification that adds mandatory on-board performance monitoring and alerting. Regulatory frameworks and operator approvals vary by region, with ICAO guidance supplemented by regional aviation authorities.