Legend 1 — Sectional Aeronautical Chart · FAA-CT-8080-2H, p. 1-1
A circled letter "C" printed next to a frequency in an airport's data block on a sectional chart indicates that frequency is the —
Why: FAA-CT-8080-2H Legend 1 lists the circled-C symbol on its own line: "Indicates Common Traffic Advisory Frequencies (CTAF)." The control tower frequency is separately labeled "CT –" and ATIS is spelled out as "ATIS," each with its own frequency.
Confuses the circled-C CTAF symbol with the control tower frequency, which the legend marks with its own "CT –" label rather than a circled C.
Confuses the circled-C CTAF symbol with ATIS, which the legend spells out as "ATIS" next to its own frequency rather than marking with a circled C.