Instrument landing system localizer
![Emission patterns of the localizer and glide slope signals.](/Images/godic/202501/20/ILS_localizer_illustration.svg5724.png")
![An Attitude Indicator, or perhaps more commonly known as the artificial horizon. The localizer is shown on the scale below the attitude gauge, and is in this case looking almost as a small white](/Images/godic/202501/20/VMS_Artificial_Horizon5724.jpg")
Instrument landing system localizer (short: localizer [LOC or LLZ]) is a system of horizontal guidance in the instrument landing system, which is used to guide aircraft along the axis of the runway.
Each radio station or system shall be classified by the service in which it operates permanently or temporarily.