A precision RNAV (PRNAV) requires?

A precision RNAV (PRNAV) system indeed requires RNP 1 (Required Navigation Performance of 1 nautical mile). This level of performance is necessary to ensure that aircraft can navigate accurately and reliably in a controlled airspace, particularly in terminal and approach environments. RNP 1 allows for precise lateral navigation, with accuracy being a crucial factor when flying closely spaced routes or performing approaches that require tight lateral constraints.

Other RNP levels, while they have their own applications, do not match the strict requirements set forth for PRNAV operations. RNP 2, RNP 3, and RNP 5 offer less stringent accuracy and, therefore, are not suitable for the precision navigation that PRNAV entails, which focuses on efficient and precise flight paths necessary in busy airspaces and during approach phases.