What does the radar velocity annunciator (ΔV) indicate about a target?

• A. It calibrates the display's azimuth.
• B. It indicates whether the target is moving toward or away and at what relative speed.
• C. It indicates the target's range to the radar.
• D. It shows the target's color on the screen.

Answer: (B)

The velocity annunciator shows the rate at which the range to the target is changing—the radial speed along the line of sight. It tells you whether the target is moving toward the radar or away from it and how fast that motion is relative to your radar. This comes from Doppler information the radar analyzes, which isolates motion along the line of sight. It does not calibrate the display’s azimuth, it does not provide the target’s actual range, and it does not show color on the screen. If the target’s motion is purely perpendicular to your line of sight, ΔV will be near zero, even if the target has significant tangential speed.