What does the term "overlap" imply in navigation?

The term "overlap" in navigation refers to a situation where vessels are very close in proximity to one another, which can increase the risk of collision or other maritime incidents. When vessels overlap, they may become so close that their safe maneuvering abilities are compromised. This necessitates heightened awareness and careful navigation by the crew of both vessels to avoid any dangerous situations. The increased risk stems from the limited reaction time and maneuvering space when vessels are in close proximity, making it essential for mariners to be vigilant and ready to take action to maintain safety.

In contrast, other options discuss various conditions that imply either improvement, safety, or distance, which do not relate to the inherent risks associated with overlapping vessels. This highlights the importance of understanding the implications of close ranges in navigation, particularly as it pertains to avoiding collisions and ensuring safety at sea.