What light characteristic is associated with a south cardinal mark?

• A. Flashing white (9)
• B. Continuous yellow
• C. Flashing red
• D. Pulsating green

Answer: (A)

A south cardinal mark is characterized by a specific lighting pattern to indicate safe waters to the south of the mark. The correct light characteristic, flashing white (nine times), helps navigators determine their position relative to the mark and the safe passage it represents.

The reason for choosing flashing white is that maritime navigation relies on standardized light signals to convey vital information about underwater hazards and navigable channels. In this case, the flashing white light pattern indicates that the area to the south of the mark is navigable, while other patterns denote different directions, ensuring clarity and safety in navigation.

Understanding these specific light characteristics is essential for the Officer of the Deck because they directly influence decision-making and the safe navigation of vessels. Each maritime mark—north, south, east, or west—has unique light signals designed to provide clear and distinct guidance to mariners in various conditions.