In this episode we break down the aircraft heading indicator and explain why it is such an important companion to the magnetic compass. We explore how this gyro driven instrument uses rigidity in space to provide a stable and easy to read heading, even in turbulence where the compass struggles. You will learn how the rotor and compass card work together, why the airplane moves around the gyro rather than the other way around, and what causes the heading indicator to drift over time. We also cover the two main sources of error, friction induced precession and the apparent drift caused by the Earth’s rotation, and why regular realignment is necessary. Finally, we look at modern solutions like the Horizontal Situation Indicator and how magnetometer slaving largely eliminates these limitations, giving pilots more reliable heading information with minimal adjustment.