Yes, a search for ‘GPS jamming Baltic’ turns up hits from everything from DW to the Financial Times.

It’s a problem for maritime and aviation navigation, and a problem for both sides in the war in Ukraine. Some drones are now using fiber optic tethers to get around the jamming, that’s not much of an option for civilian traffic though.

It’s the same as GPS (American) or Glonass (Russian). Satellite based positioning, which is vulnerable to jamming. It could also be turned off, just like the others, hence the need for an alternative.

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