What are "foul lines" in navigation?

Foul lines in navigation specifically denote areas that should be avoided due to potential hazards. This can include regions that present risks such as shoals, wrecks, or other underwater dangers that could endanger a vessel's safety. These lines serve as important indicators for mariners, guiding them to steer clear of dangerous or unsafe navigational zones.

While other terms exist, such as navigation lanes or safe passageways, foul lines serve a distinct purpose by highlighting the areas deemed hazardous. This distinction helps prevent accidents and supports a safer navigation environment. Hence, recognizing and understanding foul lines is essential for effective maritime navigation and safety.