What is the primary function of a magnetic compass in aviation?

• A. To provide altitude readings
• B. To indicate the aircraft's heading relative to magnetic north
• C. To measure airspeed
• D. To monitor engine temperature

Answer: (B)

The primary function of a magnetic compass in aviation is to indicate the aircraft's heading relative to magnetic north. This is crucial for navigation, as knowing the current heading allows pilots to maintain their intended course and avoid hazards. The magnetic compass operates based on the Earth's magnetic field, aligning itself with magnetic north and providing real-time heading information that pilots can use for flight planning, navigation, and situational awareness.

Other instruments fulfill the roles of measuring altitude, airspeed, and engine temperature, which are important for overall aircraft operation but do not pertain to the specific function of the magnetic compass. Therefore, understanding that the compass's distinct role is to provide directional information is essential for effective navigation in aviation.