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Contains both current and historical information about number stations, allowing the recording, listening and analysis. Contains both current and historical information about number stations, allowing the recording, listening and analysis.
- [Sondehub](http://sondehub.org/) - [Sondehub](http://sondehub.org/)
A worldwide map of radiosondes with detailed info such as altitude, coordinates, frequency, manufacturer, sonde-type and more. A worldwide map of radiosondes with detailed info such as altitude, coordinates, frequency, manufacturer, sonde-type and more.
- [GPSJam](https://gpsjam.org/)
Free map of GPS interference. Watch jamming around conflict zones develop over time.
## **HAM Radio** ## **HAM Radio**