What is the purpose of a Non-lateral marker with a crossed diamond symbol?

A non-lateral marker with a crossed diamond symbol is specifically designed to indicate exclusion areas, which are zones that are off-limits to boaters. These markers serve an important safety function by signaling areas where activities such as swimming, fishing, or navigation might be hazardous or restricted, such as near a dam, dredging operations, or environmental protection zones.

The crossed diamond symbol clearly communicates the message that vessels should not enter these marked areas for their safety and the preservation of the environment. Understanding the function of this marker is crucial for all boaters, as it helps prevent accidents and ensures compliance with local regulations. The other options involve navigational aids or safety guidelines for boat anchoring and navigation routes, but they do not pertain to the specific purpose of the non-lateral marker with a crossed diamond.