Pre-flight planning for GNSS operations.

Access tool Access conditions

AUGUR is a web-based tool which checks the availability of GPS integrity (RAIM – receiver autonomous integrity monitoring) for a variety of operations, including in the terminal area and on final approaches.


Part of a pilot’s duty is to check whether navigation aids will be available on their intended route and at their destination airport to make sure that navigating during the flight and on landing will be possible. This becomes more complicated if the navigation aid is orbiting in space. AUGUR tracks satellites’ scheduled maintenance activities and informs operators if they will have an impact on availability. AUGUR is also part of a NOTAM (notice to airmen) system for GNSS-based operations.

AUGUR allows users to predict RAIM availability for these operations:

  • terminal areasnwhere GPS-based RNAV 1 (including P-RNAV) or RNP 1 procedures are published
  • final approaches at airports where RNP APCH procedures to LNAV and LNAV/VNAV minima are published.

AUGUR keeps airspace users informed about the number of operational satellites and provides a way of confirming GPS’s positioning availability and integrity for a flight. AUGUR also supports GPS RAIM NOTAM services provided by national NOTAM offices. It gives NOTAM proposals containing GPS RAIM unavailability periods at destination airports where RNP APCH to LNAV and LNAV/VNAV minima will be flown. Requests for this service can be made via the EAD service desk.

GPS RAIM predictions by AUGUR are also made available as a data service through an API. For information and documentation on this service please consult the ‘Help’ on the AUGUR website.

Access conditions

AUGUR is freely accessible via a link to the web-based tool. If you are experiencing issues with accessing or using the tool, please contact us by using our page's contact form.

Requests for the GPS RAIM NOTAM proposals can be also made by our page's contact form.