GPS RAIM (Receiver Autonomous Integrity Monitoring) is a function that

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• automatically updates GPS waypoints from a database.

  Database updates are a separate process.

• ✓ uses redundant satellite measurements to detect when a satellite signal is faulty and warn the pilot.correct

  ensuring navigation integrity for IFR operations. RAIM uses 5+ satellites to cross-check measurements; with 5 satellites RAIM can DETECT a fault, with 6+ it can ISOLATE and exclude (FDE — Fault Detection and Exclusion). When RAIM is unavailable for a planned IFR approach, the pilot must have an alternate. WAAS-equipped GPS provides comparable integrity through ground-station augmentation.

• boosts GPS signal in mountainous terrain.

  GPS signal strength isn't boosted by RAIM.

• encrypts GPS data for security.

  Encryption is a different layer of GPS service.