ADS-B is best described as:

• A. Always on, provides radar-like surveillance and continuously broadcasts position
• B. Intermittent updates when queried
• C. Ground based surveillance only
• D. Replaces VOR navigation entirely

Answer: (A)

ADS-B is a surveillance technology that relies on the aircraft’s own GNSS position to continuously broadcast its location and other data. Because it’s always transmitting, ATC and other equipped aircraft receive a constant stream of position information, giving radar-like situational awareness without the need for radar interrogation. It isn’t limited to ground-based surveillance—the broadcasts are picked up by both ground stations and other aircraft with ADS-B In. It also doesn’t replace VOR navigation; navigation aids remain for navigation, while ADS-B provides enhanced surveillance. So the best description is that it’s always on, continuously broadcasting position to enable radar-like surveillance.