Figure 22 shows SANDPOINT (SZT), a non-towered airport, with its frequency "122.7" marked by a circled C. What does this tell a remote pilot about 122.7?

Why: FAA-CT-8080-2H Legend 1 defines the circled-C symbol as indicating the Common Traffic Advisory Frequency (CTAF). Sandpoint is a non-towered field (shown in magenta), so 122.7 is the CTAF manned traffic uses to self-announce in the traffic pattern.

• Confuses the CTAF with the airport's separate AWOS-3 weather frequency (135.425 at Sandpoint), a distinct frequency shown elsewhere in the airport data.
• Assumes every airport requires ATC authorization, but Sandpoint is non-towered with no surrounding Class B, C, D, or surface E airspace shown — there is no ATC authorization to request there.