Which practice improves radar collision avoidance reliability?

Which practice improves radar collision avoidance reliability?

• A. Rely on one measurement
• B. Rely on any audible cue
• C. Use multiple measurements such as range and bearing
• D. Use only the target's color

Answer: (C)

Using more than one measurement improves radar collision avoidance reliability because it reduces uncertainty about the other vessel’s position and motion. A single reading can be wrong due to noise, clutter, or transient returns, which may lead to an incorrect assessment of risk. When you combine measurements like range and bearing, you get a two-dimensional fix of the target’s location and can track how it’s moving relative to you. This redundancy helps confirm the target’s course and speed, improves the accuracy of range-rate estimates, and supports safer, timely maneuver decisions. Audible cues aren’t reliable for precise geometry and can be misleading or unavailable in complex or noisy environments, and a target’s color has no relevance to radar detection or collision avoidance.

Using more than one measurement improves radar collision avoidance reliability because it reduces uncertainty about the other vessel’s position and motion. A single reading can be wrong due to noise, clutter, or transient returns, which may lead to an incorrect assessment of risk. When you combine measurements like range and bearing, you get a two-dimensional fix of the target’s location and can track how it’s moving relative to you. This redundancy helps confirm the target’s course and speed, improves the accuracy of range-rate estimates, and supports safer, timely maneuver decisions. Audible cues aren’t reliable for precise geometry and can be misleading or unavailable in complex or noisy environments, and a target’s color has no relevance to radar detection or collision avoidance.