Flightradar24's new GPS jamming map

Original Article ↗ Hacker News Discussion ↗

Data source and methodology

  • Map derives from ADS-B messages, using the Navigation Integrity Category (NIC) as a proxy for GNSS signal quality.
  • Multiple aircraft in the same area/time reporting low NIC suggests interference; a single report can be equipment or maneuvering noise.
  • ADS-B does not distinguish GPS vs other GNSS; most aircraft are assumed to use GPS, but technically it reflects GNSS generally.
  • Coverage depends on flights plus community / commercial ADS-B receiver networks; gray or empty regions often mean “no data,” not “no interference.”

Comparison with other projects

  • Several commenters note the similarity and timing overlap with gpsjam.org, which has provided daily jamming maps for years.
  • gpsjam is generally praised for better visualization (borders, color choices), while Flightradar24 is seen as having broader coverage.
  • Some criticize FR24 as a commercial, partially black-box data provider and promote more open alternatives (e.g., airplanes.live).

Interpreting the map and notable hotspots

  • Large interference blocs around Kaliningrad, the Baltic, Poland, Finland, Sweden, and the Black Sea are tied by commenters to Russian activity and the Ukraine war.
  • Persistent interference over Turkey, Cyprus, Eastern Mediterranean, parts of Israel/Lebanon/Syria, Myanmar, Punjab (India–Pakistan), and Kashmir are linked to active or frozen conflicts and anti-drone measures.
  • A Texas/Mexico border cluster is debated: some attribute it to cartels; others cite research showing weak-signal artifacts from military training flights near Laughlin AFB.
  • Western Australia hexes are speculatively linked to radar networks, military ranges, or radio-quiet/astronomy zones; this remains unclear.

Limitations, artifacts, and ambiguity

  • Several emphasize the map shows “weak/low-quality GNSS” rather than confirmed intentional jamming; aerobatics, aircraft attitude, and hardware quirks can cause false positives.
  • Sparse traffic regions with few flights can make single flights dominate a cell’s classification.
  • No civilian flights means no data, explaining the “hole” over Ukraine and parts of Belarus.
  • Ground users often see little impact because aircraft at altitude have much longer line-of-sight to jammers.

Safety, technology, and design

  • Aviation still has non-GNSS backups (INS, ground beacons), but heavy GPS reliance means jamming increases workload and risk.
  • Discussion covers anti-jam antennas, SDR-based jammer localization, multi-constellation receivers, and spoofing vs jamming.
  • Several criticize FR24’s cartography (no borders, colorblind-unfriendly palette, coarse hexes) and want clearer, more accessible visualization.