Which marker is used to indicate areas that are prohibited for all boats?

The crossed diamond buoy is specifically designed to indicate areas that are prohibited for all boats. This type of marker communicates a clear and universally recognized message that entry is not allowed, ensuring safety and compliance with boating regulations. Areas marked with a crossed diamond buoy may include locations like swim zones, military areas, or other restricted regions where boating is not permitted.

The clarity of this symbol is crucial for maintaining safe practices on the water, as it effectively informs boat operators and ensures that they avoid venturing into zones that could pose hazards to themselves or others. Understanding the significance of the crossed diamond buoy helps boaters navigate responsibly and adhere to rules meant for the protection of all waterway users.