Which type of light characteristic would likely indicate a navigational hazard?

A fixed red light characteristic is typically used to indicate a navigational hazard. This is a common convention in maritime navigation; the color red is universally recognized as a warning signal. Navigators associate a fixed red light with the presence of an obstruction, danger, or a point of caution, such as a shoal, a dangerous rock, or a restricted area.

When a mariner sees a red light, it signals the need for vigilance and often implies that they should take care to avoid the area or show reduced speed, thereby ensuring safety while navigating. This understanding is crucial for maintaining safe passage and avoiding potential hazards at sea. Other light characteristics, such as flashing white or yellow lights, might indicate a safe passage or guide vessels, while a fixed green light typically marks the starboard side of navigational channels, indicating where it's safe to navigate.