Last Tuesday Finnish air traffic control officials warned civil aviation about large-scale GPS signal disruptions in northern Finland.
It was the first such notice issued by Finland's state-run Air Navigation Services in an official Notice to Airmen (NOTAM), in which it advised that the disturbances began on Tuesday and continued until midnight on Wednesday.
According to ANS operations director Heikki Isomaa, the warning was prompted by information obtained from sources such as Finland's Defence Forces.
Last autumn Norway's equivalent of Ficora, Nkom, speculated that the GPS disruptions were coming from Russia.
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