GPSJAM GNSS interference maps
GPSJAM GNSS interference maps
GPSJAM publishes daily hexagonal maps of likely GPS/GNSS interference derived from aircraft ADS-B navigation-accuracy reports aggregated from airplanes.live and ADS-B Exchange. The site is a free public viewer; no bulk download API is documented on the About or FAQ pages.
Coverage
Daily UTC maps from 2022-02-14 onward, updated soon after midnight UTC. Coverage follows ADS-B-equipped aircraft and receiver networks, so oceans and closed airspace can appear blank. The FAQ notes several incomplete days and that red/yellow hexes show low reported navigation accuracy, which often but not always correlates with jamming.
Verdict
This is a free GNSS-interference situational picture for Black Sea, Baltic, Eastern Mediterranean, Persian Gulf and other shipping-adjacent airspace, useful when reading AIS gaps or navigation-risk advisories. The FAQ states the site "is free to use"; Signal Lab links to the public maps rather than claiming a bulk redistribution right.
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