![]() The differences in these systems are typically a function of on-board navigational system redundancies.Ī related term is ANP which stands for "actual navigation performance." ANP refers to the current performance of a navigation system while "RNP" refers to the accuracy required for a given block of airspace or a specific instrument procedure. An RNP of 0.3 means the aircraft navigation system must be able to calculate its position to within a circle with a radius of 3/10 of a nautical mile. An RNP of 10 means that a navigation system must be able to calculate its position to within a circle with a radius of 10 nautical miles. RNP also refers to the level of performance required for a specific procedure or a specific block of airspace. Therefore, if ATC radar monitoring is not provided, safe navigation in respect to terrain shall be self-monitored by the pilot and RNP shall be used instead of RNAV. One not having such a requirement is referred to as an RNAV specification. A navigation specification that includes a requirement for on-board navigation performance monitoring and alerting is referred to as an RNP specification. The key difference between them is the requirement for on-board performance monitoring and alerting. Required navigation performance ( RNP) is a type of performance-based navigation (PBN) that allows an aircraft to fly a specific path between two 3D-defined points in space.Īrea navigation (RNAV) and RNP systems are fundamentally similar. RNP-AR 3D approach tracks to Cajamarca, Perú (above) and La Serena, Chile (below), demonstrating the benefits of precise lateral and vertical navigation on airports located on mountainous regions
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