PBN .3 Spec RNAV

RNP 0.3 is the correct answer. It is RNP as it is a PBNPBN —Performance Based Navigation system, so RNAVRNAV —Radio Navigation 0.3 is a trap answer. 0.3 is currently the most stringent specification, and is mainly used by helicopters operating in congested airspace.

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Which specification can be used in all phases of flight except for oceanic/remote, and is intended primarily for helicopters?