What is the primary function of a compass in an aircraft?

• A. To measure speed
• B. To provide altitude information
• C. To indicate the aircraft's heading
• D. To regulate cabin pressure

Answer: (C)

The primary function of a compass in an aircraft is to indicate the aircraft's heading. This device is essential for navigation, as it helps pilots determine the direction in which the aircraft is pointed relative to a reference point, typically magnetic north. Maintaining awareness of the aircraft's heading is crucial for safe flight operations, including navigation and aligning the aircraft with flight paths, airways, and runways.

While speed, altitude, and cabin pressure are important parameters for flight management, they are measured by different instruments, such as airspeed indicators, altimeters, and pressure gauges, respectively. The compass’s role in providing real-time heading information is fundamental to effective navigation and ensures pilots are able to make informed decisions during flight.