What are the main differences between RNAV and RNP specifications?
1) RNAV specifies the lateral navigation accuracy while RNP specifies both lateral and vertical navigation accuracy.
2) RNAV is a navigation specification that allows aircraft to fly on any desired flight path within the coverage of ground- or space-based navigation aids or within the limits of the capability of self-contained aids, while RNP is a navigation specification that requires onboard performance monitoring and alerting.
3) RNAV does not require onboard performance monitoring and alerting, while RNP does.
4) RNAV is used for non-precision approaches, while RNP is used for precision approaches.