What is the indication of a south cardinal mark's shape?

In the IALA Maritime Buoyage System, a south cardinal mark is specifically designed to indicate that mariners should keep to the south side of the mark when navigating in its vicinity. The distinctive shape of a south cardinal mark consists of a single downward-pointing triangle. This shape is crucial for clarity and quick identification, allowing vessels to determine their safe route effectively.

The downward-pointing triangle shape is easily recognizable and serves as a visual cue that helps pilots and navigators understand the intended route. Other shapes or patterns, such as upward-pointing triangles, horizontal stripes, or conical forms, do not conform to the established designations of cardinal marks, which could lead to confusion during navigation. Thus, the specific downward-pointing triangle ensures that its function as a south cardinal mark is unmistakable and universally understood in maritime contexts.