Finland's national airline Finnair has announced the suspension of flights to the Estonian city of Tartu for a period of one month.
The move comes after two Helsinki-Tartu flights had to turn back to Helsinki Airport last week when GPS disruptions prevented the aircraft from landing in Tartu.
Tartu airport operates a satellite-based navigation system that requires a GPS signal for aircraft approaching to land, making it susceptible to jamming.
The flights are being suspended for one month in order to give the airport time to build an approach system that does not rely on a GPS signal.
The Finnish Transport and Communications Agency Traficom reported a five-fold increase in GPS jamming incidents last year, which one security specialist said was likely part of Russia's hybrid strategy.
If GPS jamming is detected or suspected, pilots are advised to use radar or other systems independent of GPS signals.
Raine Luojus, Managing Director of Finntraffic Air Navigation Services, told Yle that flight safety is not compromised in situations where the GPS signal is not used.
"We have navigation equipment on the ground that aircraft can use and navigate normally," Luojus said, adding that Finland and the Baltic countries have a comprehensive surveillance radar system, so air traffic controllers can see where aircraft are flying at all times.
"If necessary, air traffic controllers assist the aircraft by providing guidance until the aircraft has regained its navigational capability," he said.
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