What is a system in which the heading gyro is continuously corrected to agree with a remotely located magnetic direction sensing device?

• A. Slant range
• B. Simplified directional facility
• C. Skin friction drag
• D. Slaved compass

Answer: (D)

In aviation navigation, a system where the heading gyro is continuously corrected to agree with a remotely located magnetic direction sensing device is called a slaved compass. The aircraft carries a remote magnetometer (flux valve) that senses the actual magnetic heading, and a servo system adjusts the heading indicator so the gyro’s display stays aligned with that magnetic direction. This arrangement compensates for gyro drift and precession, keeping the indicated heading accurate without manual realignment.

Other terms listed don’t describe this mechanism: slant range is a line‑of‑sight distance concept, the simplified directional facility is a separate approach/navigation aid, and skin friction drag is an aerodynamic force.