What does a buoy showing an exclamation symbol or magenta color indicate?

The buoy displaying an exclamation symbol or a magenta color serves as a warning marker indicating a danger or a potentially hazardous condition. It is important to note that while these buoys can indeed be unlighted, their primary purpose is to signal caution to mariners about underwater hazards or other dangers.

Buoys that are lighted generally provide additional navigational information, often featuring a specific light pattern to convey their message. However, a buoy marked with an exclamation or in magenta is often associated with cautionary messages regarding nearby dangers, prompting vessels to proceed with increased awareness and care. In this scenario, the indication that it is lighted may not directly apply to the buoy type exhibiting an exclamation symbol or magenta color; its function primarily revolves around the alerting of risks rather than the lighting status.