The availability of the navaid infrastructure has to be considered in order to enable the navigation application. The Navaid Infrastructure relates to ground- or space-based navigation aids that are called up in each Navigation Specification. An RNP specification includes a requirement for on-board self-contained performance monitoring and alerting while an RNAV specification does not. A Navigation Specification is either an RNP specification or an RNAV specification. Associated with the navigation specification are requirements related to pilot knowledge and training and operational approval. The Navigation Specification also describes how these performance requirements are to be achieved i.e., which navigation functionalities are required to achieve the prescribed performance.
The Navigation Specification prescribes the performance requirements in terms of accuracy, integrity, continuity for proposed operations in a particular Airspace.
The PBN Concept is comprised of three components: The Navigation Specification, the Navaid Infrastructure and the Navigation Application. The others are Communications, ATS Surveillance and ATM. PBN is one of several enablers of an Airspace Concept. PBN is then described through means of RNAV and RNP applications with respective RNAV and RNP operations.
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