Finland reports GNSS and mobile network interference impacting aviation, maritime, and cellular communications - Hybrid War Tracker

Signal

Submitted

Apr 24, 2026 22:05 UTC

4d ago

Finland reports GNSS and mobile network interference impacting aviation, maritime, and cellular communications

Cyber & Information WarfareCyber AttacksAttacks on critical infrastructure (energy, transport, hospitals)

Aggressor

Summary

Finland reports GNSS and mobile network interference in spring 2026 causing aviation, maritime, and cellular disruptions linked to Russian self-protection jamming near the eastern border.

Traficom, Finland's national transport and communications authority, observed increasing satellite navigation and mobile network interference in early 2026, notably affecting aviation at cruising altitudes over southern and central Finland, maritime navigation in the eastern Gulf of Finland, and localized cellular disruptions near Finland's eastern border. Mobile network disruptions now occur during day and night, causing dropped calls though the overall network remains operational due to redundant synchronization measures. This interference is attributed to Russian self-protection jamming aimed at shielding critical Russian assets. Traficom has filed formal interference complaints with Russia and the ITU. Preparedness through alternative aviation navigation methods and resilient communications infrastructure ensures public safety and functionality. The interference rises with improved spring radio propagation, with spoofing activity also reported.

Evidence

"In spring 2026, interference affecting satellite navigation (GNSS) and mobile networks, as well as related observations recorded by Traficom, have increased."
"GNSS interference is observed particularly in aviation around the clock in southern and central Finland."
"Disruptions to mobile communications have a localised impact in south-eastern Finland near the eastern border, and disturbances may also occur during the daytime."
"Interference affecting both mobile network and GNSS frequencies originates from Russian territory. It is linked to Russia’s so-called self-protection jamming, which is used to protect its critical assets," says Juurakko-Lehikoinen.
"The redundancy of communications networks is governed by Traficom Regulation 54, which requires network synchronisation to a reference clock system located in Finland, and the network must be capable of withstanding at least two weeks of GNSS disruption."
In April 2026, Traficom submitted new official reports on interference affecting GNSS and mobile network frequencies to Russia and the International Telecommunication Union (ITU).
"The increase in interference has also been reflected in a rise in GNSS interference reports during spring 2026, particularly in aviation."
"Mobile network disruptions may also occur during the daytime... For users, interference may appear as dropped calls or failed connection attempts."
"At ground level, GNSS disruptions may occur locally in areas very close to the eastern border or in coastal areas of the eastern Gulf of Finland."

Classification

Confidence: High

The article explicitly attributes the interference affecting GNSS and mobile networks to Russian self-protection jamming targeting Finnish critical infrastructure, with detailed spectrum monitoring data and official interference reports submitted by Finland to Russia and the ITU. This establishes a clear hostile aggressor signal consistent with hybrid warfare tactics.

Source URL

https://rntfnd.org/2026/04/23/finland-cellular-also-impacted-by-interference

Open source

Source reliability

Info credibility

Event time

Apr 21, 2026 18:13 UTC

Event time confidence

exact

Location

Southern and central Finland (aviation), eastern Gulf of Finland (maritime), southeastern Finland near eastern border between Lappeenranta and Vaalimaa (mobile networks)

Region

Southern and Central Finland

Primary actor

Russian self-protection jamming

Country

Finland

Countries

Finland