What are RNAV approaches?
RNAV is a method of navigation that permits aircraft operation 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, or a combination of these.
What is the different of RNAV and RNP approach?
An RNAV procedure is one that requires you to have an RNAV system in order to fly it. RNP, or Required Navigation Performance adds specific performance standards onto RNAV systems. It defines several levels of performance that are applied to specific airspace and operations.
What is required for an RNAV approach?
A newer level of GPS nonprecision approach minimums has been available for about five years: localizer performance (LP). Flying an RNAV approach to LNAV minimums requires only a basic IFR GPS input, but in order to utilize LP minimums the GPS receiver must have spaced-based augmentation system (SBAS) capability.
Do RNAV approaches have glideslope?
In the real world, you can have something called “LPV”, which is a category of RNAV that’s precise enough that the computer provides an imaginary glideslope to follow. This glideslope is 100% calculated based on GPS position and altimeter reading, and not based on ground signals.
Is RNP better than RNAV?
Is RNP more accurate than RNAV? No. RNAV systems conform to the ICAO performance-based navigation specification for total system error (TSE). RNAV total system error is the 95% probability that the navigation system accuracy remains within the limits defined for the RNAV operation.
Is RNP and RNAV same?
While both RNAV navigation specifications (NavSpecs) and RNP NavSpecs contain specific performance requirements, RNP is RNAV with the added requirement for onboard performance monitoring and alerting (OBPMA). RNP is also a statement of navigation performance necessary for operation within a defined airspace.
Do RNAV approaches have vertical guidance?
Vertical guidance is not provided. When the aircraft reaches the final approach fix, the pilot descends to a minimum descent altitude (MDA) using the onboard barometric altimeter (aka “dive and drive”).