How do you convert true heading to magnetic heading?

To convert true heading to magnetic heading, you need to consider the Earth's magnetic variation, which is the angle difference between true north and magnetic north. Magnetic variation can be either east or west, depending on your geographical location.

When you are in a position where the magnetic north is east of true north, the variation is described as east variation. In such cases, to find the magnetic heading, you would subtract the east variation from the true heading. This is why subtracting east variation is the correct procedure.

If the variation is west, then you would add that to the true heading to arrive at the magnetic heading. The importance of understanding this conversion lies in navigation accuracy, as relying on the correct heading ensures that pilots can effectively follow their intended flight path.

The option that mentions adjusting based on flight speed is not relevant in this context, as variation does not change with speed but is a factor of geographical location. Understanding how to adjust headings based on magnetic variation is crucial for ensuring proper navigation in flight.