What range of techniques should vessels fitted with radar use to assess risk?

Vessels equipped with radar should utilize a range of techniques to effectively assess risk and maintain safe navigation. The correct answer highlights the importance of combining long-range and short-range techniques, such as scanning, plotting, and compass bearings.

Long-range scanning allows the crew to detect objects and potential hazards from a distance, giving them sufficient time to react. Short-range scanning is essential for monitoring closer threats, ensuring that any immediate dangers can be addressed swiftly. Plotting helps in tracking the movement of other vessels or objects over time, providing insight into potential collisions or changes in their course. Lastly, compass bearings offer precise directional information, allowing navigators to determine the positions of other vessels with accuracy.

Together, these techniques create a comprehensive picture of the navigational environment, facilitating informed decisions and enhancing overall safety on the water. This multi-faceted approach contrasts sharply with the other options, which either limit assessment techniques too narrowly or rely solely on visual observations, which can be less effective, especially in poor visibility conditions.