Which statement about ADF receivers is true?

• A. They always include a false information warning
• B. They never include a false information warning
• C. They sometimes include a false information warning
• D. They require GPS input to function

Answer: (B)

ADF receivers are radio navigation instruments that determine bearing to non-directional beacons (NDBs) without relying on GPS. Because of how they operate, there isn’t a built-in feature that flags “false information” in the way some GPS or integrated nav systems do. They simply show the relative bearing to the beacon, and pilots cross-check with other sources if something seems off. So they do not require GPS input to function, and there isn’t a standard false information warning to rely on, making the statement that they never include such a warning the best choice.