An azimuth card may be set, gyroscopically controlled, or driven by a remote compass. Which description best matches an azimuth card?

• A. A device used to measure airspeed.
• B. A navigation display showing attitude.
• C. A card that may be set, gyroscopically controlled, or driven by a remote compass.
• D. A chart for plotting routes.

Answer: (C)

The azimuth card is the heading-display element of a directional indicator. It shows the aircraft’s heading in degrees and can be operated in three ways: it can be manually set to align with a known heading, it can be driven by a gyroscopic directional gyro to keep the display steady and accurate, or it can be driven by a remote compass that provides the heading information from another sensing source. This makes it a versatile heading reference, not an airspeed indicator, an attitude display, or a plotting chart.