What does the localizer provide in an ILS system?

In an Instrument Landing System (ILS), the localizer is a crucial component that provides course guidance to the runway centerline. This means it helps the pilot determine the horizontal alignment needed to approach the runway accurately. The localizer operates using specific radio frequencies that create a highly directional signal, and it indicates whether the aircraft is to the left or right of the ideal approach path. By following the localizer’s guidance, pilots can ensure that they are properly aligned with the runway during the final stages of their approach, which is essential for a safe landing. Other components of the ILS are responsible for vertical guidance or additional information, but the primary function of the localizer is to aid in achieving the correct course alignment with the runway.