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![airmainengineer Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1169088148745400320.png) aircraftmaintenancengineer [@airmainengineer](/creator/twitter/airmainengineer) on x 31.6K followers
Created: 2025-07-09 09:00:01 UTC

🛰️ Understanding RAIM – GPS Integrity Monitoring in Aviation

RAIM is a critical feature in GPS-based navigation systems that ensures signal integrity by identifying faulty satellite data.

✈️ Key Concepts:

• Requires X or more satellites to detect anomalies (RAIM FD).
• Needs X or more to exclude the faulty signal and continue safely (RAIM FDE).
• If a range anomaly is detected, the system either alerts the pilot or eliminates the faulty satellite to maintain safe navigation.

💡 RAIM helps ensure precision and trust in GNSS-based procedures like RNAV and RNP, especially in non-radar environments.

📸 by fb/aircraft

![](https://pbs.twimg.com/media/GvXO4iHXAAAWPrQ.jpg)

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[Post Link](https://x.com/airmainengineer/status/1942871352509091900)