ABBREVIATIONS A D E F B C G 129 AAF - Army Air Field AAS - Airport Advisory Service AAUP - Attention All Users Page AC - Advisory Circular ADF - Automatic Direction Finder ADIZ - Air Defense Identification Zone ADS - Automatic Dependent Surveillance ADS-B - Automatic Dependent Surveillance-Broadcast Advsry - Advisory AFB - Air Force Base AFIS - Automatic Flight Information Service AFS - Air Force Station AFSS - Automated Flight Service Station AGL - Above Ground Level AIM - Aeronautical Information Manual AIRAC - Aeronautical Information Regulation And Control AK - Alaska AL - Approach and Landing ANG - Air National Guard APP - Approach APP CON - Approach Control APP CRS - Approach Course Apt - Airport APV - Approaches with Vertical Guidance ARP - Airport Reference Point ARTCC - Air Route Traffic Control Center ASDA - Accelerate-Stop Distance Available ASDE-X - Airport Surface Detection Equipment-Model X ASOS - Automated Surface Observing Station ASR - Airport Surveillance Radar ATC - Air Traffic Control ATIS - Automatic Terminal Information Service ATS - Air Traffic Service AUNICOM - Automated Aeronautical Advisory Station AWOS - Automated Weather Observing Station Baro-VNAV - Barometric Vertical Navigation BS - Broadcast Station CAC - Caribbean Aeronautical Chart CAT - Category CFA - Controlled Firing Areas CFR - Code of Federal Regulations CH - Channel CL - Runway Centerline Lights CLNC DEL - Clearance Delivery CNF - Computer Navigation Fix COP - Changeover Point CPDLC - Controller Pilot Data Link Communication CRS - Course CT - Control Tower GBAS - Ground-Based Augmentation System GCO - Ground Communications Outlet GLS - GBAS Landing System GND - Ground GND CON - Ground Control GNSS - Global Navigation Satellite System GP - Glide Path GPS - Global Positioning System GS - Glide Slope GS - Ground Speed FAA - Federal Aviation Administration FAF - Final Approach Fix FAP - Final Approach Point FAR - Federal Aviation Regulation FBO - Fixed-Based Operator FIR - Flight Information Region FL - Flight Level FLIP - Flight Information Publication FMS - Flight Management System FREQ - Frequency FRZ - Flight Restricted Zone FSDO - Flight Standards District Office FSS - Flight Service Station E - East EFAS - Enroute Flight Advisory Service EFB - Electronic Flight Bag Elev - Elevation EMAS - Engineered Materials Arresting System DA - Decision Altitude DA - Density Altitude D-ATIS - Digital Automatic Terminal Information Service DH - Decision Height DME - Distance Measuring Equipment DND - Department of National Defense (Canada) DoD - Department of Defense DOF - Digital Obstacle File DP - Departure Procedure DT - Daylight Savings Time DVA - Diverse Vector Area CZ - Control Zone (Canada) CVFP - Charted Visual Flight Procedure CTAF - Common Traffic Advisory Frequency FAA Chart Users’ Guide - Abbreviations