When ATC issues radar traffic information in relation to the 12-hour clock, what does the reference correspond to?

• A. Ground track
• B. Magnetic heading
• C. Airspeed
• D. Altitude

Answer: (A)

Clock positions for radar traffic information are referenced to your ground track—the direction you’re actually moving over the ground. When ATC says a plane is at your 12 o’clock, they’re describing where that airplane is relative to the path you’re following on the ground, i.e., straight ahead along your track. This is useful because your heading can differ from your track due to wind drift, so tying the reference to the actual path over the surface keeps the descriptor accurate. Magnetic heading, airspeed, or altitude don’t define this clock-based bearing, since they describe orientation, speed, or vertical position rather than where another aircraft lies relative to your movement over the ground.