Instrument landing system
![ILS planes](/Images/godic/202501/24/ILS_planes_coloured.svg3925.png")
![The localizer station for runway 27R at Hannover Airport in Germany](/Images/godic/202501/24/EDDV-ILS_27R_Localizer3926.jpg")
![Details of five antennas of the ILS at Pisa Airport, Italy](/Images/godic/202501/24/Ils_pisa3926.jpg")
![The pilot has to correct to the left and a little upwards.](/Images/godic/202501/24/ILS_gauge.svg3926.png")
An instrument landing system (ILS) enables aircraft to land if the pilots are unable to establish visual contact with the runway. It does this by way of transmitted radio signals.
It is defined by the International Telecommunication Union as a service provided by a station as follows: