WIDE AREA AUGMENTATION SYSTEM (WAAS). The Wide Area Augmentation System (WAAS) uses a system of ground stations to provide necessary augmentations to the GPS Standard Positioning Service (SPS) navigation signal. A network of precisely surveyed ground reference stations is strategically positioned across the country to collect GPS satellite data. Using this information, a message is developed to correct any signal errors.
WARNING AREA. See special-use airspace.
ACRONYMS / ABBREVIATIONS
AC. Advisory circular AIP. Airport improvement program
ADF. Automatic direction finder ALS. Approach lighting system
ADG. Airplane design group ALSF-1. Standard 2,400-foot high-
intensity approach lighting system with AFSS. Automated flight service station sequenced flashers (Cat I configuration)
AGL. Above ground level ALSF-2. Standard 2,400-foot high-
intensity approach lighting system with AIA. Annual instrument approach sequenced flashers (Cat II configuration)
APV. Instrument approach procedure with vertical guidance ARC. Airport reference code ARFF. Aircraft rescue and firefighting ARP. Airport reference point ARTCC. Air route traffic control center ASDA. Accelerate-stop distance available
ASR. Airport surveillance radar ASOS. Automated surface observation station
ATCT. Air traffic control tower
ATIS. Automated terminal information service AVGAS. Aviation gasoline (typically 100
low lead (LL))
AWOS. Automated weather observation station BRL. Building restriction line CFR. Code of Federal Regulations CIP. Capital improvement program CPO. Community Planning Organization DME. Distance measuring equipment DNL. Day-night noise level DWL. Runway weight bearing capacity for
aircraft with dual wheels per strut DTWL. Runway weight bearing capacity for aircraft with dual-tandem type landing gear
EAA. Experimental Aircraft Association FAA. Federal Aviation Administration FAM. Financial Aid to Municipalities FAR. Federal Aviation Regulation FBO. Fixed base operator FY. Fiscal year GA. General Aviation GPS. Global positioning system GS. Glide slope HIRL. High-intensity runway edge lighting IFR. Instrument flight rules ILS. Instrument landing system IM. Inner marker LDA. Landing distance available LIRL. Low-intensity runway edge lighting LMM. Compass locator at middle marker LOC. ILS localizer LOM. Compass locator at ILS outer marker LORAN. Long range navigation MALS. Medium-intensity approach
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