What does a specialized mark indicate?

A specialized mark is specifically designed to indicate a particular feature or hazard in navigable waters. These marks are used to provide information about areas that may require special attention from mariners, such as underwater hazards, pipelines, or designated swimming areas. Unlike other types of navigation aids that may give general directions or indicate safe passage, specialized marks focus on conveying crucial information about local features or conditions that could impact navigation and safety.

While general navigation directions, temporary anchorage areas, and communication signals play important roles in the aids to navigation system, they are not the primary purpose of specialized marks. The latter is distinctly sufficient in highlighting specific characteristics or dangers that necessitate caution or awareness for vessels navigating those waters.