Which color is most visible for a distress signal at sea?

The most visible color for a distress signal at sea is orange. This is due to its high visibility against the blue background of the ocean and the grayish tones of cloudy skies, making it easily noticeable from a distance. Orange is often used for life rafts, signal flares, and other maritime safety equipment because it stands out well in various conditions, including during daylight and overcast weather. The effectiveness of orange comes from its ability to attract attention quickly, which is crucial in emergency situations where quick rescue response is vital.

In contrast, while red is sometimes associated with alerts and warning signals in various contexts, it does not have the same level of visibility in marine environments due to its darker hue. Yellow, though bright, can blend in with certain natural surroundings and might not provide the best contrast against the water and sky. White, while visible, can often get lost against the backdrop of clouds and bright sunlight, making it less effective for signaling distress at sea.