Question 35

The Correct Answer is A. A white buoy with a blue horizontal band is the standard color scheme used in the U.S. Aids to Navigation System (USATONS) for **mooring buoys**. These buoys are typically privately maintained and mark an authorized area where vessels may temporarily anchor or tie up. **Why the other options are incorrect:** * **B) A hydrographic data collection buoy:** While data collection buoys often use white as their primary color, they are usually marked with lettering indicating their purpose (e.g., 'ODAS' or 'Data') and do not specifically rely solely on a blue band for identification in this context. Furthermore, they fall under the 'Special Purpose Buoy' category, which is usually identified by yellow coloring in the IALA system (which USATONS is part of). * **C) Marking a restricted area:** Restricted or regulatory areas (like swimming, danger, or exclusion areas) are marked by **white buoys with orange markings** (shapes like diamonds, circles, or squares) under the USATONS system (often called the 'Uniform State Waterway Marking System' or regulatory buoys). * **D) An isolated danger mark:** Isolated danger marks are internationally standardized (under the IALA system) as **black buoys with a red horizontal band(s)**, usually topped with two black spheres.