Question 30 AB01 - Able Seafarer

The Correct Answer is B **Explanation for Option B (The north quadrant of the mark):** Cardinal marks are navigation aids that indicate the location of the deepest water relative to the mark. They are defined by their top marks (two black cones), their color scheme (yellow and black horizontal bands), and their distinct light characteristics. A **North Cardinal Mark** is designed to indicate that the safe, deepest water lies to the north of the buoy. Its defined light sequence is an **uninterrupted quick-flashing (Q) or very quick-flashing (VQ) white light**. Therefore, a cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water is located in the north quadrant of the mark. **Explanation of Incorrect Options:** * **A) The south quadrant of the mark:** This is indicated by a **South Cardinal Mark**. The light characteristic for a South Cardinal Mark is a group of six quick or very quick flashes plus one long flash ($\text{Q}(6) + \text{L}$ or $\text{VQ}(6) + \text{L}$). * **C) The east quadrant of the mark:** This is indicated by an **East Cardinal Mark**. The light characteristic for an East Cardinal Mark is a group of three quick or very quick flashes ($\text{Q}(3)$ or $\text{VQ}(3)$). * **D) The west quadrant of the mark:** This is indicated by a **West Cardinal Mark**. The light characteristic for a West Cardinal Mark is a group of nine quick or very quick flashes ($\text{Q}(9)$ or $\text{VQ}(9)$).