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Instrument landing system
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===Identification=== In addition to the previously mentioned navigational signals, the localizer provides for ILS facility identification by periodically transmitting a 1,020 Hz [[Morse code]] identification signal, that always starts with Morse Code letter "I", for ILS, two dots. For example, the ILS for runway 4R at [[John F. Kennedy International Airport]] transmits IJFK to identify itself, while runway 4L is known as IHIQ. This lets users know the facility is operating normally and that they are tuned to the correct ILS. The glide slope station transmits no identification signal, so ILS equipment relies on the localizer for identification.
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