AUGUR is a navigation monitoring service provided by EUROCONTROL Network Manager to support the implementation and operation of PBN and other CNS applications based on GNSS. The service provides GNSS availability information and degradation alerts as well as a GPS RAIM prediction tool, a mean by which airspace users can comply with the EASA requirements during pre-flight planning. The webpage is organized as follows:

The GNSS Constellation Status tab provides users with an overview of the current state of the GPS satellite constellation, essential for RAIM predictions and navigation reliability. This tab includes the following features:

• Scenario Information: Displays the start, end, and last update times (in UTC) of the current prediction scenario. The time period covered is defined as 72h since the current day at 00:00 UTC.
• Almanac Data: Defines the almanac used in the RAIM prediction. Provides details of the current almanac, including the GPS week, Time of Applicability (TOA), total number of active satellites, and PRNs of unhealthy satellites, if any.
• NANUs: Lists any current NANU (Notices Advisory to NAVSTAR Users) affecting the satellite constellation. A message is displayed if no NANUs are applicable to the current scenario. The NANUs are issued by the United States Coast Guard (USCG) and are available on the USCG NAVCEN website.
• Sky Plot Visualization: Offers a graphical representation of satellite positions in the sky, allowing users to analyze constellation geometry.
• Space Weather Information: Summarizes key space weather advisories, including effects, intensity, affected regions, and forecasts for the upcoming hours.

This panel provides the GPS prediction outages for one or several airports within the time period defined:

• Scenario Start Time: Refers to the start time of the RAIM prediction.
  By default, the start time is set to 00:00 UTC on the current day, as specified in the “GNSS Constellation Status” panel.
  Alternatively, users may select a past date (since September 1st, 2020) to retrieve RAIM outage predictions for that period (referred to as “prediction in the past”).
• Airports: Defines the list of airports or FIR where the RAIM availability is predicted.
  Both airports and FIRs must be identified using their ICAO code. Users may input up to 20 airports. However, only one FIR is permitted.
  This functionality is restricted to airports within ECAC and MEDA countries, including their overseas territories.
  On iPhone: To access the keyboard, tap on the left side of the text box.

The user can select the following parameters to configure the RAIM prediction:

• RAIM Algorithm: Options are FD (Fault Detection) or FDE (Fault Detection and Exclusion).
  Note: FDE predictions typically have lower availability compared to FD, which can lead to misinterpretation. It is therefore recommended to use FD rather than FDE. FDE prediction is primarily required for certain oceanic operations that rely on GPS-only systems without onboard inertial navigation sensors.
• Selective Availability (SA): Options are On (unaware) or Off (aware).
  Selective Availability has not been utilized since May 2000, and the GPS III constellation does not include this feature. However, older receivers, particularly those certified under TSO-C129, may still assume SA is active.
  Note: In cases where this information is unavailable, selecting "SA On" is considered more conservative as it predicts more outages.
• Barometric Aiding: Options are “Baro Aiding” or “No Baro Aiding”.
  Note: “Baro Aiding” indicates that the onboard navigation equipment incorporates barometric altitude aiding.
• Mask Angle: Options are 2.0°, 5.0°, 7.5°, 10.0°, or 12.5°.
  Satellites at elevations below the mask angle are excluded from the RAIM prediction. Selecting higher elevation mask angles (e.g., 7.5°, 10°, or 12.5°) simulates the impact of satellites being blocked by terrain, such as mountains near an aerodrome.
  Note: AUGUR does not use a digital terrain model (DTM) to determine satellite visibility.
• Type of procedure: Options are APPROACH (RNP 0.3) or TERMINAL (RNP 1.0).

Displaying Outages and Warnings for EGNOS-Based Approaches: AUGUR can display outages and warnings for EGNOS-based approaches obtained from NOTAMs published by EAD. These include the following procedures:

• RNP Approach to LP
• RNP Approach to LNAV/VNAV based on EGNOS
• RNP Approach to LPV

To enable this feature, activate the EGNOS NOTAMs checkbox. Clicking on "Check Outages" invokes the RAIM prediction calculation. Once the calculation is complete, the results are presented to the user in both graphical and textual formats.


Clicking on "Check outages" invokes the RAIM prediction calculation and once the calculation is finished the results are presented to the user both in graphical and textual formats.

By clicking in "Save" button at Configuration section, the user can download an XML containing the selected configuration (RAIM prediction settings and the list of airports or FIR).
This XML file can be uploaded using the "Load" button to restore saved configuration.
An example of the XML structure is provided below.

EUROCONTROL provides GPS RAIM NOTAM proposals for airports upon request by Air Navigation Service Providers (ANSPs).
Note: To add an aerodrome to the NOTAM proposal service, the ANSP must submit a request to EAD via the EAD Servicedesk at [email protected].
The proposals are generated using the same algorithms implemented in AUGUR and are based on the following input parameters:

• RAIM Algorithm: FD
• Selective Availability: Aware (Off)
• Barometric Aiding: No Baro Aiding
• Mask Angle: 5.0°
• Type of procedure: APPROACH (RNP 0.3)

The GNSS Advisories tab offers a user-friendly interface designed to visualize all GNSS-related data in a single geographical map, providing users with actionable insights for navigation and prediction. The map features interactive layers that can be toggled on or off to display specific datasets.
Data layers:

Each layer can be independently enabled or disabled. It also supports data import and export in GeoJSON format.

The Connectivity tab enables users to integrate and automate AUGUR's functionalities into their workflows through two key services: