The special light for a vessel engaged in public safety activities must be located _____________.

The correct answer emphasizes the importance of proper visibility for navigation lights in conjunction with the special light designated for vessels involved in public safety activities. This positioning ensures that the special light does not obstruct or confuse the visibility of the navigation lights, which are critical for safe operation and communication with other vessels. By ensuring that the special light is placed in a way that maintains the clarity of the navigation lights, it helps prevent accidents and misunderstandings while underway.

Proper arrangement of lights is crucial for all vessels to ensure they are easily identifiable to other waterway users. This allows other boaters to discern the specific type of vessel and its activities, thereby enhancing overall safety on the water. When special lights for public safety activities are positioned correctly, they contribute to both the operational effectiveness of the vessel and the safety of surrounding vessels, which is why the answer focuses on this critical aspect of light placement.