R S U V T W 131 FAA Chart Users’ Guide - Abbreviations TOC - Top of Climb TOD - Top of Descent TODA - Takeoff Distance Available TOGA - Takeoff/Go Around TORA - Takeoff Runway Available TPP - Terminal Procedures Publication TRSA - Terminal Radar Service Area TWR - Tower R - Radial R - Receive R - Restricted Area (Special Use Airspace) RCO - Remote Communications Outlet RF - Radius-to-Fix RNAV - Area Navigation RNP - Required Navigation Performance RNP AR - Required Navigation Performance Authorization  Required ROC - Required Obstacle Clearance RP - Right Pattern RVR - Runway Visual Range RVSM - Reduced Vertical Separation Minimum Rwy - Runway UC - Under Construction UHF - Ultra High Frequency UIR - Upper Information Region UNICOM - Universal Communications U.S. - United States USA - United States Army USAF - United States Air Force USCG - United State Coast Guard UTA - Upper Control Area S - South SAAAR - Special Aircraft and Aircrew Authorization  Required SAAR - Special Aircraft and Aircrew Requirements SATNAV - Satellite Navigation SDF - Simplified Directional Facility SER - Start End of Runway SFAR - Special Flight Rules Area SFC - Surface SFRA - Special Flight Rules Area SIAPs - Standard Instrument Approach Procedures SID - Standard Instrument Departure SM - Statute Mile SMAR - Special Military Activity Routes SMGCS - Surface Movement Guidance and Control System SOIA - Simultaneous Offset Instrument Approaches SSV - Standard Service Volume STAR - Standard Terminal Arrival Procedure SUA - Special Use Airspace SVFR - Special Visual Flight Rules VCOA - Visual Climb Over Airport / Airfield VDA - Vertical Descent Angle VDP - Visual Decent Point VFR - Visual Flight Rules VGSI - Visual Glide Slope Indicator VHF - Very High Frequency VMC - Visual Meteorological Conditions VNAV - Vertical Navigation VOR - VHF Omnidirectional Radio Range VORTAC - VHF Omnidirectional Radio Range/Tactical Air Navigation VPA - Vertical Path Angle VR - Visual Route (Military) W - Warning Area (Special Use Airspace) W - West WAAS - Wide-Area Augmentation System WAC - World Aeronautical Chart WP - Waypoint WX CAM - Weather Camera (Alaska) T - Transmit TA - Travel Advisory TAA - Terminal Arrival Area TAC - Terminal Area Chart TACAN - Tactical Air Navigation TAS - True Air Speed TCA - Terminal Control Areas (Canada) TCH - Threshold Crossing Height TDZ - Touchdown Zone TDZE - Touchdown Zone Elevation TDZL - Touchdown Zone Lights TDZ/CL - Touchdown Zone/Centerline Lights TERPS - U.S. Standard for Terminal Instrument Procedures TFR - Temporary Flight Restriction TIBS - Telephone Information Briefing Service TIS-B - Traffic Information Service - Broadcast