CA.VI.B.K2FAA-S-ACS-7B · Nov 2023Knowledge
Satellite-based navigation (e.g., equipment, regulations, authorized use of databases, ...
Satellite-based navigation (e.g., equipment, regulations, authorized use of databases, and Receiver Autonomous Integrity Monitoring (RAIM)).
Bottom line
RAIM verifies the usability of the received GPS signals and warns the pilot of any malfunction in the navigation system. RAIM is required for IFR-certified GPS units. Without RAIM capability, the pilot has no assurance of the accuracy of the GPS position.
Key numbers
| Number | What it means |
|---|---|
| 5 satellites in view, or 4 satellites plus baro-aiding | RAIM detect |
| 6 satellites in view, or 5 satellites with baro-aiding | RAIM isolate |
| 4 satellites minimum | 3D position |
FAA references
- PHAK Glossary (p. G-25) — FAA-H-8083-25C (2023)
- PHAK ch. 16 (p. 16-31) — FAA-H-8083-25C (2023)
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