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Headline: A strong surface-level GNSS jamming attack affected all GNSS bands in the Southeast Baltic Sea near Bornholm starting July 1, 2025, disrupting navigation and positioning systems.
Short Summary: 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.
Extended Summary: 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.
On July 1, 2025, the Southeast Baltic Sea experienced a new, strong surface-level jamming attack against GNSS signals impacting extensive maritime areas around Bornholm, Denmark. This attack affected all GNSS bands, severely disrupting positioning data for units at sea level over a wider area than typical single-source jammers. The campaign followed a week of less intense spectrum disruptions and was comparable in severity to an earlier attack two weeks before that coincided with a large political event on Bornholm involving Denmark's elite and 100,000 visitors. The jamming intensity decreased by the morning of July 2, as indicated by data from Bornholm. Swedish stations' full data are pending, but available plots show widespread GNSS signal degradation across constellations such as GPSS1C. This type of GNSS-jamming threatens maritime navigation safety and regional stability in the strategically important Baltic Sea.
Classified as an aggressor event because the content describes deliberate GNSS jamming attacks disrupting critical maritime navigation in the Baltic Sea region near Denmark. There is no mention of defense or countermeasures deployed.
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