Different airports operate under different conditions. Smaller airports (in size and level of air traffic) may only operate during daylight hours meaning they require less additional guidance and support and may only need typical runaway markings and airfield lighting. Larger commercial airports will be required to operate during night-time hours and, therefore are obligated to be sufficiently equipped with navigational aids to support take-offs, landings and manoeuvres. The various forms of Navaids all work in different ways to deliver the same result ILS systems focus on ensuring a smooth and safe landing for all aircraft by offering accurate horizontal and vertical support during their approach and landing. Their function is critical during periods of low/poor visibility. DME systems utilise ultra-high frequencies (UHF) to receive and send signals to and from the aircraft enabling it to calculate its flight position and determine a time-to-station value based on the time it takes for the aircraft’s DME transceiver to receive a response from the DME station. An airport surveillance radar (ASR) is a radar system used at airports to detect and display the presence and position of aircraft in the terminal area, the airspace around airports. It is the main air traffic control system for the airspace around airports. As a systems integrator, we supply install and commission ground-based navaids and radars from the world’s leading manufacturers of these safety-critical systems.