What color is typically used for Special Marks?

The color typically used for Special Marks in the IALA Maritime Buoyage System is yellow. This designation is important in maritime navigation as yellow marks indicate specific features or areas that require awareness, such as a designated swimming area, a cable crossing, or a limit of a fishing zone. Special marks are not tied to a particular side of a channel or approach, which sets them apart from other buoy types like lateral marks that indicate safe passage along channels.

The use of yellow provides high visibility against water and sky, making it easier for mariners to identify these unique markers during daylight and in many lighting conditions. This consistency in color helps maintain uniformity in navigational aids across different regions, which is crucial for safe navigation.