EASA updates SIB on GNSS Outage & Alterations

Vasileios PAPAGEORGIOU • 6 November 2023
in community Cybersecurity

EASA updates SIB on GNSS Outage & Alterations

GNSS jamming and spoofing has shown increase in terms of both intensity and severity in recent years. This was the conclusion following an analysis conducted by EASA based on recent data from the Network of Analysts as well as open sources.


As a result, EASA has published the Safety Information Bulletin (SIB) on Global Navigation Satellite System (GNSS) Outage and Alterations Leading to Navigation / Surveillance Degradation on March 17, 2022. The SIB 2022-02 was updated to Revision 1 (R1) on February 17, 2023. Revision 2 has been published today, November 6, 2023 in order to reflect the latest results on the EASA SIB Tool.

This revision provides the following updated information:

  • Examples of symptoms of suspected GNSS spoofing for aircraft <no change>.
  • The list of the most affected flight information regions (FIR) <no change>.
  • Examples of issues that a degradation of GNSS signal (including Satellite Based Augmentation Systems (SBAS) and Ground Based Augmentation Systems (GBAS)) could generate with the addition of references to Terrain Avoidance and Warning Systems (TAWS).
  • Revised recommendations for civil aviation authorities (CAAs), air traffic management/ air navigation services (ATM/ANS) providers and air operators (including helicopter operators – with specific information on both jamming and spoofing that flight crews and relevant flight operations personnel should be aware of). New for this revision are also recommendations for aircraft and equipment manufacturers.

In this Air Ops community post you may find some examples of indication of suspected GNSS spoofing and recommendations for mitigating the risks of potential GNSS jamming and/or spoofing.

Do you know the difference between jamming and spoofing? If yes let us know in the comments.. if not, worry not! A dedicated post will be published on the topic within the coming weeks.

Last but not least, don’t forget to follow the Air Ops community to stay updated in everything related to Air Operations.

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