Question: What Is The Difference Between RNAV And GNSS?

Does RNAV require GPS?

When the use of RNAV equipment using GPS input is planned as a substitute means of navigation guidance for part of an instrument approach procedure at a destination airport, any required alternate airport must have an available instrument approach procedure that does not require the use of GPS..

How does RNAV approach work?

RNAV is a method of navigation which permits the operation of an aircraft on any desired flight path; it allows its position to be continuously determined wherever it is rather than only along tracks between individual ground navigation aids.

What is an LPV approach?

Localiser Performance with Vertical Guidance (LPV) is defined as an Approach with Vertical Guidance (APV); that is, an instrument approach based on a navigation system that is not required to meet the precision approach standards of ICAO Annex 10 but that provides both course and glidepath deviation information.

Are LPV approaches considered precision?

Even though LPV approaches have vertical guidance, they’re not considered precision approaches. Instead, they’re an approach with vertical guidance (APV). … The extremely accurate WAAS system (7.6 meters or better accuracy) gives you lateral and vertical guidance down to a decision altitude (DA) like an ILS.

What does RNAV 1 mean?

Area NavigationFor the purposes of this AC, the specified RNAV accuracy must be met 95% of the flight time. … (1) RNAV 1 requires a total system error of not more than 1 NM for 95% of the total flight time. (2) RNAV 2 requires a total system error of not more than 2 NM for 95% of the total flight time.


In its simplest form, VOR/DME RNAV allows the pilot to electronically move VORTACs around to more convenient locations. Once electronically relocated, they are referred to as waypoints. These waypoints are described as a combination of a selected radial and distance within the service volume of the VORTAC to be used.

What is the difference between RNAV Y and RNAV Z?

On the RNAV Y approach, the LNAV minimums are considerably higher (800 feet) than the LNAV minimums on the RNAV Z approach (560 feet). … Because of the two different means of clearing the obstacle on the final approach segment, you can see some of the main differences in the minimums box of both approaches.

What is an RNAV GPS approach?

RNAV (GPS) Approaches. Localizer Performance without Vertical Guidance. (LP) and Lateral Navigation (LNAV) LPs are non-precision approaches with WAAS lateral guidance. They are added in locations where terrain or obstructions do not allow publication of vertically guided LPV procedures.

Why is ILS Z or Y?

The Y uses an RNAV TAA to join the procedure and requires GPS. The Z uses conventional ground navaids to join the procedure and requires either DME or radar. The two procedures can’t be charted on the same chart because the Z has an MSA defined whereas the Y does not.

What does WAAS stand for?

Wide Area Augmentation SystemSatellite Navigation – Wide Area Augmentation System (WAAS) About FAA. All Visitors Federal Aviation Administration Search.

What is RNAV GNSS?

RNAV, Defined This “direct-to” capability often allows aircraft to bypass published routes, freeing up more airspace for traffic. RNAV also allows aircraft to fly instrument approaches into airports that don’t have any ground-based navigation stations, like a VOR or Localizer.

What is the main difference between RNAV and RNP?

RNAV airspace generally mandates a certain level of equipment and assumes you have a 95% chance of keeping to a stated level of navigation accuracy. RNP is a part of Performance Based Navigation (PBN) which adds to the same RNAV accuracy standards a level of system monitoring and alerting.

What does ILS Z mean?

The ILS Z or LOC Z RWY 2 approach uses conventional ground based Navaids of VOR and DME for that purpose and has an MSA. Anytime the same navigation facility is used for the final approach, but there are multiple versions for whatever reason, an index letter starting at Z, Y, X ..

Can you use GPS for a VOR approach?

The AIM prohibits you from using GPS (even if it’s IFR approach approved) as the sole source of navigation on a VOR approach – one that doesn’t say “or GPS” in the title. But, it does allow you to use GPS for navigation, as long as you tune and monitor your position for final course alignment using VOR indications.

What approaches require WAAS?

WAAS is required for LP, LPV, and LNAV/VNAV (without baro-VNAV) approaches. Approved vertical guidance is available on LNAV/VNAV minimums, and existed before the WAAS system was certified.