What does a 'Special Mark' (Marca Especial) look like, and what does it indicate in Chilean waters?

1. Red and white stripes indicating an international border
2. Solid yellow color, optional yellow 'X' topmark, indicating special features such as aquaculture zones, oceanographic buoys, or recreation areas
3. Green and yellow checkered buoy marking a sunken shipwreck
4. Black and white horizontal stripes marking deep water anchorages