As the approach to Tartu currently requires a GPS signal, Finnair cannot fly there in the event of GPS interference. The systems on Finnair’s aircraft detect GPS interference, and the pilots are well aware of the issue. The aircraft also have other navigation systems that can be used when the GPS system is unserviceable.
Most airports use alternative approach methods, but some airports, such as Tartu, only use methods that require a GPS signal to support them. The GPS interference in Tartu forces Finnair to suspend flights until alternative solutions have been established.
Since 2022, there has been a rise in GPS interference, with Finnair pilots particularly noting disruptions around Kaliningrad, the Black Sea, the Caspian Sea, and the Eastern Mediterranean. Generally, such GPS disruptions do not impact flight paths or safety because pilots are prepared for these occurrences, and aircraft are equipped with backup systems that activate when GPS signals are compromised.
