What color combination is used for a South Cardinal Mark?

A South Cardinal Mark is specifically designed to indicate the safe navigable water to the south of the mark. The color combination of yellow above black is used for these markers to provide clear and distinctive identification for mariners. The yellow signifies caution and indicates that the danger is towards the north, while the black section serves as a visual contrast, enhancing visibility and recognition during both daylight and nighttime conditions.

This specific design aligns with the IALA Maritime Buoyage System, which aims to provide standardized navigation aids that are easily interpretable and recognizable, assisting in safe passage for vessels. The clarity of this color combination ensures that users can quickly determine their position relative to the navigable channel.