When validating a potential false target, which cue is most useful?

When validating a potential false target, which cue is most useful?

• A. AIS identity alone
• B. Weather radar data
• C. Visual cues on the radar display
• D. Depth data

Answer: (C)

Visual cues on the radar display provide direct, real-time evidence of whether an echo is a real target or an artifact. By watching how the echo moves across successive sweeps, you can judge if its motion is plausible for a vessel—steady speed and a consistent course that aligns with the ship’s own movement, and a track that remains coherent in ARPA. A true contact tends to have a predictable, continuous plot and persists in a way that matches other data you’re gathering. A false target, on the other hand, often appears only intermittently, jitters, flickers, or behaves erratically, or it sits in clutter near land or in a weather cell. These on-screen cues let you validate or dismiss the contact quickly. AIS identity alone isn’t always reliable because it may be unavailable, out of date, or misleading. Weather radar data can show clutter or precipitation but doesn’t confirm a real surface target. Depth data doesn’t provide useful validation for a surface vessel. So, the most useful cue for validating a potential false target is what you observe directly on the radar display.

Visual cues on the radar display provide direct, real-time evidence of whether an echo is a real target or an artifact. By watching how the echo moves across successive sweeps, you can judge if its motion is plausible for a vessel—steady speed and a consistent course that aligns with the ship’s own movement, and a track that remains coherent in ARPA. A true contact tends to have a predictable, continuous plot and persists in a way that matches other data you’re gathering. A false target, on the other hand, often appears only intermittently, jitters, flickers, or behaves erratically, or it sits in clutter near land or in a weather cell. These on-screen cues let you validate or dismiss the contact quickly.

AIS identity alone isn’t always reliable because it may be unavailable, out of date, or misleading. Weather radar data can show clutter or precipitation but doesn’t confirm a real surface target. Depth data doesn’t provide useful validation for a surface vessel. So, the most useful cue for validating a potential false target is what you observe directly on the radar display.