What does shadowing in radar mean and how does it affect ARPA tracking?

Prepare for the ARPA and Radar Operation Test. Enhance your skills with multiple choice questions, detailed explanations, and real-time simulations. Ensure maritime safety with confidence!

Multiple Choice

What does shadowing in radar mean and how does it affect ARPA tracking?

Shadowing happens when a larger object, like land or a bigger vessel, blocks the radar’s line of sight to a target, causing the target to be only partially visible. In ARPA tracking, that partial visibility means the radar can’t reliably measure the target’s range and bearing, so the automatic tracker may lose the target or produce a degraded, inaccurate track. When the obstruction clears, you can reacquire the target and resume tracking. This situation is why the correct choice states that a target is obscured by a larger object or land, causing partial visibility, and ARPA may lose or mis-track unless reacquired.

Shadowing happens when a larger object, like land or a bigger vessel, blocks the radar’s line of sight to a target, causing the target to be only partially visible. In ARPA tracking, that partial visibility means the radar can’t reliably measure the target’s range and bearing, so the automatic tracker may lose the target or produce a degraded, inaccurate track. When the obstruction clears, you can reacquire the target and resume tracking. This situation is why the correct choice states that a target is obscured by a larger object or land, causing partial visibility, and ARPA may lose or mis-track unless reacquired.

More practice questions