ASA 105: Skill 7, Aids to Navigation, Unlighted marks
7. Explain the significance of shapes, colors, and lights used in the U.S. Aids to Navigation (ATON) system. Nun buoy Conical top is a requirement for nun buoys. If marking a channel they have even numbers are red in color and are left to starboard when entering, port when departing. Ready references include: Chart One , Page 125 Eldridge 2022, Page 214 Boat Navigation for the Rest of Us, inside flaps and back cover Shapes and colors are important for day piloting. Lights on buoys are often correlated to the color of the buoy itself. Nuns have conical tops. Red nuns with even numbers are lateral marks denoting the left side of the channel when heading seaward. Nuns are not lighted. Cans have cylindrical tops. Green cans with odd numbers denote the right side of the channel when proceeding seaward. Cans are not lighted. Tower buoys may have a sound signal or a light or both. The color denotes the buoy's significance. Red or Gree...