What does "restricted visibility" refer to in the context of the Navigation Rules?

"Restricted visibility" specifically refers to conditions where visibility is less than a defined distance, which can occur due to factors such as fog, rain, snow, or even atmospheric conditions. According to the Navigation Rules, particularly Rule 3, "restricted visibility" is defined as visibility of less than two nautical miles. This is crucial for the safe navigation of vessels, as it significantly affects the ability to see other vessels, navigational aids, and obstacles, increasing the risk of collisions.

In such situations, vessels must take appropriate actions, including sounding fog signals, adjusting speed, and maintaining a lookout, to navigate safely and avoid accidents. The emphasis on maintaining safe practices under restricted visibility conditions is vital for preventing maritime incidents.

Weather conditions with high winds or heavy traffic do not specifically describe visibility limitations, and an area near a busy harbor can have good visibility, making these options less relevant to the definition of "restricted visibility."