Who is actually congesting aircrafts’ general practitioner in the Baltic?

.ON APRIL 29TH Finnair, Finland’s national airline company, pointed out that it would suspend tours to the eastern Estonian city of Tartu for a month. Last week 2 aircrafts were forced to turn around after their family doctor signals were disrupted. GPS playing has raised sharply in the Baltic location over the past 2 years.

Who lags it and also how harmful could it be actually?