What's the RNP requirement with KZAK FIR? I thought it is RNP 10 operating in NOPAC AND PACOTS, but I am not sure.
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$\begingroup$ Related: ICAO - Overview of Oceanic and Continental Remote Navigation Specifications. RNAV-10 prescribed, RNP-4 optional (and no authorization required). $\endgroup$– minsApr 13, 2017 at 21:34
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To be exact RNAV 10 is required when operating in the KZAK FIR. This enables 50NM longitudinal and lateral separation between aircrafts.
Unfortunately, the requirement might be designated RNP 10 due to legacy reasons. The difference between RNAV and RNP is that RNAV requires no onboard performance monitoring and alerting capability, while, among other things, RNP does.
RNP 4 is optional to allow closer 30NM longitudinal and lateral separation between RNP 4 capable/authorized aircraft thus increasing the airspace capacity.
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