Parts of Poland, Lithuania, southern Sweden, and other countries in the Baltic region had an unexpected Christmas present this year. GPS signals were disrupted and not available in many areas on the 25th and 26th of December. Poland seemed to be particularly impacted, with the northern two-thirds of the country affected and many users on the ground and in the air having to make do without reliable service.

On New Year’s Eve, parts of Finland experienced significant jamming as well. The most visible impacts of the holiday events were seen in aviation and low navigation integrity reports from ADS-B systems. These were displayed on the website.

Experts in the United States and Poland point to Russia as the source of the interference. 

Read more in GPS World article.