Which light rhythm is associated with a South Cardinal Mark?

A South Cardinal Mark is designed to indicate that safe water lies to the south of the mark. The light rhythm associated with a South Cardinal Mark is characterized by a series of quick flashes followed by a longer flash, which is specifically denoted as VQ(6) + Long Flash every 10 seconds. This means that it exhibits six quick flashes in a sequence, followed by a longer flash.

The use of six quick flashes is crucial as it differentiates the South Cardinal Mark from other navigational aids. This specific lighting pattern communicates to mariners not only the cardinal direction but also provides an unmistakable signal that helps in the safe navigation of vessels. The long flash serves as a clear marker that helps observers confirm their identification of the buoy, especially during challenging visibility conditions.

The other light rhythms listed do not match the established IALA conventions for a South Cardinal Mark. Their configurations either suggest different frequencies or types of flashes, which would correspond to other types of marks, and therefore would not correctly indicate the presence of a South Cardinal Mark. Understanding these distinctive light patterns is essential for safe navigation and situational awareness at sea.