A light having characteristics that includes color variations is defined as?

The term that best describes a light with characteristics that include color variations is "alternating." In the context of aids to navigation, "alternating" refers to lights that change color in a specific sequence. These color changes serve important navigational purposes, allowing mariners to identify the light and its characteristics, which can help indicate their position or the nature of a navigational mark.

The alternating light characteristic typically consists of a predefined cycle of colors, which could include a combination of red, green, white, or other colors to convey specific meanings. This system is vital for ensuring safe navigation, particularly in areas with various hazards or route choices.

Understanding the concept of alternating light helps mariners interpret the signals they encounter, promoting safety and awareness on the water. In contrast, the other terms do not accurately capture the idea of changing colors in a systematic way used in navigation. For instance, switching and oscillating refer more broadly to the on/off transition and rapid changes in intensity or position rather than color, while fluctuating implies an irregular or random change rather than a structured sequence.