In the Northern Hemisphere, when will a magnetic compass indicate a turn toward the north?

The magnetic compass behaves in a way that reflects the Earth's magnetic field but can also show deviations based on the aircraft's movement. When an aircraft is accelerating on an east or west heading, the compass will typically indicate a turn toward the north due to a phenomenon known as magnetic dip or compass precession.

During acceleration, the magnetic compass can lag behind the actual heading because the compass card is influenced by the inertial forces acting on it. As the aircraft moves forward, the compass tends to show a turn toward the north even if the aircraft is maintaining a constant heading. This effect is more pronounced when traveling on an east or west heading since the north magnetic pole is positioned toward the northern hemisphere.

Understanding this phenomenon is crucial for pilots, as it helps in interpreting compass readings correctly during various flight maneuvers.