What type of danger does an obstruction marker indicate?

An obstruction marker indicates hazardous underwater topography, which includes obstacles that can pose a risk to navigation. These markers are typically used to alert boaters to submerged rocks, wrecks, or other underwater hazards that could potentially damage a vessel or cause accidents. By clearly marking these dangers, obstruction markers play a critical role in promoting maritime safety, helping boaters to avoid areas where they might run aground or collide with obstacles below the water's surface. Recognizing these markers is essential for safe navigation, ensuring that boaters remain aware of potential risks that could affect their journey. Understanding the role and importance of these markers is vital for anyone operating a boat.