Starting July 1, 2025, a strong surface-level GNSS jamming attack targeted the Southeast Baltic Sea region, impacting vessels and units at sea level far beyond the reach of a single ground-based jammer. The attack disrupted all GNSS bands, affecting critical navigation and positioning systems. The most severe prior attack occurred two weeks earlier, coinciding with a meeting of Denmark's political elite and approximately 100,000 visitors on Bornholm island. The intensity diminished by the morning of July 2. Related GNSS data plots from Swedish stations are incomplete, but Bornholm data confirm the attack's duration and scale, with disruptions evident across multiple GNSS constellations.

Starting July 1, 2025, a strong surface-level GNSS jamming attack targeted the Southeast Baltic Sea region, impacting vessels and units at sea level far beyond the reach of a single ground-based jammer. The attack disrupted all GNSS bands, affecting critical navigation and positioning systems. The most severe prior attack occurred two weeks earlier, coinciding with a meeting of Denmark's political elite and approximately 100,000 visitors on Bornholm island. The intensity diminished by the morning of July 2. Related GNSS data plots from Swedish stations are incomplete, but Bornholm data confirm the attack's duration and scale, with disruptions evident across multiple GNSS constellations.