NavigationQuestion 294 of 934

What is the minimum number of satellites that GPS needs for an accurate three-dimensional position?

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

A minimum of four satellites is necessary to establish an accurate three-dimensional position.

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