How is a special mark buoy identified?

A special mark buoy is characterized primarily by its yellow coloration, which sets it apart from other types of buoys in the IALA system. The yellow color serves to indicate that the buoy marks an area or feature of special significance and is used to alert mariners to specific navigational information or hazards that do not fall under the general categories of safe water, danger, or isolated dangers.

Furthermore, the specific light pattern associated with special mark buoys typically includes either a specific rhythm of flashes or a steady light, which helps to differentiate it from other buoy types to ensure that mariners easily recognize its purpose. This intentional design aids in maintaining safe navigation and awareness on the water.

The other options describe characteristics that correspond to different types of buoys or navigational aids; for example, the red color and flashing light are often associated with cardinal marks or laterally buoyed channels, while white and steady light indicates a safe water mark. Blue buoys typically do not fit within the IALA system used for navigational purposes.