GPSJAM Map Daily Maps Of GPS Interference
Mon, 04/14/2025 - 8:30am
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    18 years
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What exactly does this map show?
Many aircraft broadcast information about how accurate their navigation system (which is almost always GPS) is at any given moment. The GPSJAM map aggregates that data over 24 hours in time and displays it as a hexagonal map. Green hexagons show where more than 98% of all aircraft who flew through that area reported good navigation accuracy. Yellow hexagons show where between 2% and 10% of aircraft reported low navigation accuracy. Red hexagons show where more than 10% of aircraft reported low navigation accuracy.
another version
FlightRadar24 provides a map produced from similar information.
https://www.flightradar24.com/data/gps-jamming
As both maps process data transmitted by aircraft in flight, they don't provide good information in places with negligible suitable flights.
As the receivers used are mostly operated by amateur volunteers, the maps are also missing information where there are few or none of the volunteer receivers, even if suitable aircraft do fly there.
personal GPS user since 1992