Global Positioning System (GPS) disturbances detected across NATO member Poland have sparked speculation of Russian involvement, following a similar incident in the region this month.

Polish news outlet Radio Zet portal reported "over northern and central Poland, the GPS signal was again jammed," with Warsaw, Łódź, Tricity and Olsztyn among cities affected and that Swedish military intelligence agency MUST was investigating the cause.

Other Polish news outlets reported disturbances and an interference map available on the website showed the extent of GPS problems across much of Poland, with a high level of interference over Kaliningrad, the Russian enclave that borders the country.

"Russians tested EW in Kaliningrad, so almost half of Poland and the Suwalki corridor were left without GPS," said Jürgen Nauditt, who posts on X, formerly Twitter, about the war in Ukraine, referring to the strategically sensitive area between Belarus and Kaliningrad along the Polish-Lithuanian border.

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