Disturbances in GPS (Global Positioning System) navigation signals were observed in eastern and southeastern Finland on Sunday, according to the Finnish Transport and Communications Agency (Traficom).
Like drivers on the road, GPS navigation is also used by airplane pilots.
News service STT asked the agency about the matter after the disruptions were seen on the GPSjam website, which provides information about GPS interference.
John Wiseman, GPSjam's administrator, announced the jamming incident on the social media platform X early on Monday.
Wiseman suggested the disturbances were relatively extensive, while also noting that similar incidents have occurred in Finland in recent years.
The reported disruptions were based on information from aviators across a fairly wide area in Finland on New Year's Eve, according to Traficom's aviation chief Jari Pöntinen.
According to Pöntinen, Sunday's GPS disturbances did not affect flight safety, because planes are outfitted with alternative navigation systems.
Pöntinen was unwilling to comment on the suspected causes of the signal disturbances.
"I am not able to assess [what caused the disturbances] in any way. I can only focus on the effects of them on flight safety," Pöntinen said.
Pöntinen said that he did not want to take a position on whether Russia was somehow involved in the increased GPS interference, but did note that such disruptions usually occur near conflict areas.
"For example, there have been disturbances in the Baltic Sea near Kaliningrad, in the Black Sea Region and in the Middle East, such as near Israel," Pöntinen said, adding that in those kinds of locations GPS disruptions are generally constant.
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