"Glideslope" redirects here. For the company, see GlideSlope.
In aviation, instrument landing system glide path, commonly referred to as a glide path (G/P) or glide slope (G/S), is "a system of vertical guidance embodied in the instrument landing system which indicates the vertical deviation of the aircraft from its optimum path of descent".[1]
^ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.106, definition: instrument landing system (ILS)