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PA.VI.B.K2FAA-S-ACS-6C · Nov 2023Knowledge

Satellite-based navigation (e.g., equipment, regulations, authorized use of databases, ...

ACS element text (the applicant demonstrates understanding of)

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

Key numbers for Satellite-based navigation (e.g., equipment, regulations, authorized use of databases, ...
NumberWhat it means
5 satellites in view, or 4 satellites plus baro-aidingRAIM detect
6 satellites in view, or 5 satellites with baro-aidingRAIM isolate
4 satellites minimum3D position

FAA references

  1. PHAK Glossary (p. G-25) — FAA-H-8083-25C (2023)
  2. PHAK ch. 16 (p. 16-31) — FAA-H-8083-25C (2023)
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