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INVENTORY OF EXISTING CONDITIONS VOR/DME, but they can also be used with VOR and DME facilities. Runways 16R and 16L both feature Instrument Landing Systems (ILS), which is an approach path that provides horizontal and vertical alignment for an aircraft on final approach. Guidance information is provided through the combination of a localizer and a glide slope. Localizers provide horizontal runway centerline guidance whereas glide slopes provide vertical guidance. The Airport’s RNAV and GPS approaches rely on Global Positioning System (GPS). GPS is a space-based satellite system that provides position and time information. GPS satellites are owned by the United States Government and controlled by the Department of Defense. The Airport also features Runway Visual Range (RVR) equipment on Runway 16R-34L. This system consists of three sensors, one on each end of the runway and one in the center, which work to determine real-time visibility conditions. Additionally, to support the FAA Terminal Radar Approach Control Facility (TRACON) that is combined with the Airport Traffic Control Tower facility, an Airport Surveillance Radar (ASR) is stationed to the north of the Eugene VORTAC. The ASR is used by FAA air traffic controllers to track aircraft moving through the airspace they are controlling. 1.4.5.3Meteorological Aids Meteorological aids at the Airport consist of an Automated Surface Observing Station (ASOS), which was st installed on September 1, 1995. The ASOS provides real time weather updates to air traffic control personnel and pilots, as well as recording data used by the National Weather Service. Additionally, the airport has a Runway Weather Information System (RWIS) which provides real time data used by Airport operations personnel. TABLE 1-4 VISUAL AIDS AND ELECTRONIC AIDS Primary RunwayParallel Runway 16R34L16L34R Visual Aids Lighting SystemHIRLHIRLHIRLHIRL Approach LightingALSF-IIODALSMALSRREIL Touchdown Zone Lightingyesnonono Visual Slope IndicatorPAPIVASIPAPIPAPI Runway MarkingsPrecision Precision PrecisionPrecision RWY Centerline Lightsyesyesnono Electronic Aids (Approaches) ILS or LOC DMEyesnoyesno ILS CAT II-III yesnonono RNAV RNPyesyesyesyes RNAV GPSyesyesyesyes VOR/DMEyesyesnono Source: FAA Chart Supplements, FAA.gov, Prepared by RS&H, 2016 Notes: ALSF-II = High intensity approach light system with sequenced flashers, MALSR = Medium intensity approach light system with runway alignment indicator lights, ODALS = Omnidirectional approach light system, PAPI = Precision approach path indicator, VASI = Visual approach slope indicator, REIL = Runway end identifier lights, RVR = Runway visual range is used for determining airfield visibility for all precision approaches. EUGENE AIRPORT MASTER PLAN 1-13