Which device provides a visual distress signal during both day and night?

• A. Flares purpose
• B. Strobe light purpose
• C. Air horn purpose
• D. Signaling mirror purpose

Answer: (A)

Visual distress signals that work across day and night rely on devices that produce a highly visible cue regardless of lighting. Flares fit this role because they emit bright light and color that are easily seen from a distance in daylight, and their intense flare provides a clear beacon at night as well. In contrast, signaling mirrors rely on sunlight and are ineffective at night; strobe lights are most useful after dark and can be harder to pick up in bright daylight; air horns signal acoustically but don’t provide a visual cue. So, flares give a visible distress signal in both conditions, making them the best choice.