Emergency wreck buoy

[1] The buoy is designed to "provide a clear and unambiguous"[1] mark of a new and uncharted danger.

The buoy is painted with 4, 6 or 8 vertical stripes of alternate yellow and blue.

Optionally it may carry a vertical (St. George's) cross painted yellow.

The light flashes alternate yellow and blue for one second each with a half second gap between.

[2] The International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA) defined the buoy in response to the sinking of the MV Tricolor and the subsequent collisions with the wreck by the Dutch vessel Nicola and Turkish-registered fuel carrier Vicky.