The number of satellite navigation system disruptions in Finland has increased this year, according to Traficom, the Finnish Transport and Communications Agency.
The incidents have particularly affected aviation and maritime activities, the agency said.
So far this year there have been 1,779 disruptions in satellite navigation systems affecting aviation and 145 similar incidents affecting water traffic.
During this period authorities detected 211 incidents of navigation system jammers, according to Traficom.
Based on reports from drivers, the number of navigation system disruptions on land has remained stable. However, the agency said that there have been reports of disturbances on Finnish motorways, particularly in coastal areas and in eastern parts of the country.
Traficom said the disturbances affecting aviation and maritime traffic originated from outside Finland's borders.
Aviation navigation disruptions have particularly occurred over the Gulf of Finland, and began increasingly affecting maritime traffic at the end of April.
Such disruptions involve disturbances in the reception of Global Navigation Satellite Systems (GNSS).
Although GPS disruptions have increased this year, their effects are usually limited and short-lived, according to Traficom. In most cases GNSS positioning is restored after a short while, or those affected have been able to continue their journeys using alternative navigation methods.
However, Traficom said that disruptions affect the smoothness of operations and cause more work for those impacted by them.