Airports are plotted in their true geographic position unless the symbol conflicts with a NAVAID at the same location. In  such cases, the airport symbol will be displaced, but the relationship between the airport and the NAVAID will be retained. Airports are identified by their designated name. Generic parts of long airport names (such as "airport," "field," or "municipal") and the first names of persons are commonly omitted unless  they are needed to distinguish one airport from another with a similar name. The figure at right illustrates the coded data that is provided along with the airport name. The elevation of an airport is the highest point on the usable portion of the landing areas.  Runway length is the length of the longest active runway, including displaced thresholds and  excluding overruns. Runway length is shown to the nearest 100', using 70 as the rounding  point; a runway 8070' in length is charted as 81, while a runway 8069' in length is charted as  80. If a seaplane base is collocated with an airport, there will be additional seaplane base  water information listed for the elevation, lighting and runway. Airports with Control Towers (CT) and their related data are shown in blue. All other airports and their related data are  shown in magenta. The   symbol indicates that runway lights are on from dusk to dawn.   indicates that the pilot must  consult the Chart Supplement to determine runway lighting limitations, such as: available on request (by radio-call, letter,  phone, etc), part-time lighting, or pilot/airport controlled lighting. Lighting codes refer to runway edge lights. The lighted  runway may not be the longest runway available, and lights may not be illuminated along the full length of the runway. The  Chart Supplement has a detailed description of airport and air navigation lighting aids for each airport. A dash represents  no runway edge lights. The symbol  indicates the existence of a rotating or flashing airport beacon operating from dusk to dawn. The Aeronau - tical Information Manual (AIM) thoroughly explains the types and uses of airport lighting aids. 16 FAA Chart Users’ Guide - VFR Terms and Symbols UNICOM Flight Service Station on field Elevation in feet Airports where fixed wing special VFR  operations are prohibited (shown above  airport name) FAR 91 Lighting in operation Sunset to Sunrise Indicates FAR 93 Special Air Traffic  Rules and Airport Traffic Pattern Lighting limitations exist; refer to Chart Supple - ment Location Identifier Length of longest runway in hundreds of feet;  usable length may be less ICAO Location Identifier Aeronautical advisory station Control Tower (CT) - primary frequency Runways with Right Traffic Patterns (public use) Star indicates operation part-time. See  tower frequencies tabulation for hours of  operation See Chart Supplement Follows the Common Traffic Advisory  Frequency (CTAF) VFR Advisory Service Shown when ATIS is  not available and frequency is other than the  primary CT frequency Automatic Terminal Information Services Weather Camera (Alaska) Automatic Flight Information Service Airport of Entry Automated Surface Weather Observing  Systems; shown when full-time ATIS is  not available When information is lacking, the respective  character is replaced by a dash. Lighting codes  refer to runway edge lights and may not repre - sent the longest runway or full length lighting.