Which term describes the system whereby the heading gyro is corrected to align with a remote magnetic direction sensing device?

• A. Slant range
• B. Simplex
• C. Slaved compass
• D. SRM

Answer: (C)

Keeping a heading indicator accurate involves correcting the gyro’s natural drift by using a remote magnetic reference. In this setup, a remote magnetic direction sensing device measures the Earth’s magnetic field and feeds that information to a slaving system. The slaving unit automatically adjusts the heading gyro so its display matches the magnetic reference, effectively making the gyro “follow” the remote sensor. That automatic alignment keeps the aircraft’s displayed heading in line with magnetic north despite the gyro’s tendency to drift over time. This arrangement is known as a slaved compass, because the compass reference is used to drive and correct the heading indicator. The other terms don’t describe this relationship: they refer to different concepts such as distance measurement, communication modes, or unrelated systems.