Which buoy color combination signifies danger in the IALA system?

In the IALA Maritime Buoyage System, the color combination of black and yellow is utilized to signify danger. This is specifically represented by special marks that indicate features such as underwater obstructions or areas that are hazardous to navigation. The use of these colors is established to provide clear visual cues to mariners, enhancing safety by alerting them to potential dangers in the waterway.

The significance of black and yellow is rooted in the standardized practice of using contrasting colors that stand out in various sea and weather conditions, ensuring that the warnings are easily visible. These markings help to communicate important information to navigators swiftly, promoting safer navigation in challenging areas.

Other color combinations, like red and white, green and red, and white and blue, serve different purposes within the buoyage system. For example, red is often associated with port side markers and safe waters in some contexts, while green indicates starboard side markers. Understanding these specific meanings helps ensure that navigators can interpret the various buoy indications correctly and respond appropriately.