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openfsd/docs/index.md
2025-05-12 17:21:16 -07:00

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# VATSIM FSD Protocol Documentation
> Updated January 2025
FSD is an application-layer TCP/IP protocol facilitating real-time communications between all clients connected to the [VATSIM](https://vatsim.net) Network.
This documentation is reverse-engineered.
See [openfsd](https://github.com/renorris/openfsd) for an alternative, free and open-source FSD server implementation.
For an introduction, see the [About](/about/) page.
*This documentation is an independent work and is not affiliated with, endorsed by, or associated with VATSIM, Inc.*