RNAV Navigation Requirements (Nav Specs) Nav Specs can be a list of plane and aircrew necessities needed to guidance a navigation software within a defined airspace thought. For each RNP and RNAV designations, the numerical designation refers to the lateral navigation accuracy in nautical miles which is predicted being attained https://lorenzortusr.suomiblog.com/5-tips-about-pbn-you-can-use-today-46944499