NavigationQuestion 838 of 934

What is the minimum number of satellites in view that RAIM needs to detect an integrity anomaly without baro-aiding?

  1. Five
  2. Three
  3. Four
  4. Six
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Correct answer: Five

RAIM needs five satellites in view, or four satellites and a barometric altimeter.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 16: Navigation — Global Positioning System, page 418

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Questions last reviewed: 18 October 2026