97 FAA Chart Users’ Guide - Terminal Procedures Publication (TPP) - Terms On procedures with both PBN elements and ground-based equipment requirements, the PBN requirements box will be  listed first. Several different symbols may appear within the Notes Box: The negative   within a black square box symbol shown in the Notes section below any “A” or “T” Symbol indicates that  outages of the WAAS (Wide Area Augmentation System) vertical guidance may occur daily at this location due to initial  system limitations. WAAS NOTAMs for vertical outages are not provided for this approach. Use LNAV minima for flight  planning at these locations, whether as a destination or alternate. For flight operations at these locations, when the WAAS  avionics indicate that LNAV/VNAV or LPV service is available, then vertical guidance may be used to complete the ap- proach using the displayed level of service. Should an outage occur during the procedure, reversion to LNAV minima may  be required. When   appears in the Notes section below all other symbols it indicates a cold temperature altitude correction is  required at that airport when the reported temperature is at or below the published temperature. Advise ATC with alti- tude correction. Advising ATC with altitude corrections is not required in the final segment. See Aeronautical Information  Manual (AIM), Chapter 7, for guidance and additional information. For a complete list of cold temperature airports, see  https://aeronav.faa.gov/d-tpp/Cold_Temp_Airports.pdf.  When “ASR”, “PAR” or “ASR/PAR” appear in the Note section immediately below the “T” and “A” symbols it indicates there  are published Radar Instrument Approach Minimums. Where radar is approved for approach control service, it is used  not only for radar approaches (Airport Surveillance Radar [ASR] and Precision Approach Radar [PAR]) but is also used to  provide vectors in conjunction with published non-radar approaches based on radio NAVAIDs (ILS, VOR, NDB, TACAN).  Radar vectors can provide course guidance and expedite traffic to the final approach course of any established IAP or to  the traffic pattern for a visual approach. Notes Symbols An entry is published in the Takeoff Minimums, (Obstacle) Departure Procedures, and Diverse Vector Area  (Radar Vectors) section of the TPP.  Non-standard IFR alternate minimums exist. Refer to IFR Alternate Airport Minimums section of the TPP. Alternate minimums are not authorized due to unmonitored facility or absence of weather reporting service. WAAS (Wide Area Augmentation System) Cold Temperature Airport