What does CBDR stand for in the context of navigation risks?

The correct interpretation of CBDR in the context of navigation risks is "Constant Bearing Decreasing Range." This term is crucial in maritime navigation as it describes a situation where two vessels maintain a constant bearing to each other while the distance between them decreases. This indicates that one vessel is on a collision course with another.

In navigation, understanding CBDR is important for mariners to assess potential collision risks. When two vessels have a constant bearing and the range is decreasing, it is imperative for the vessel that is not at fault to take appropriate action, such as altering course or speed, to avoid a collision. The concept promotes situational awareness and timely decision-making.

Other choices do not accurately reflect the terminology used in navigating and collision assessment. “Constant Bearing Decreasing Range” uniquely captures the essence of the scenario described, which is vital for effective communication and operational safety among vessels at sea.