What should operators do when encountering a day mark?

When operators encounter a day mark, they should observe its color for navigational guidance. Day marks are prominent visual aids that are used during daylight hours to assist mariners in navigation. The color of the day mark is significant as it conveys specific information regarding navigation rules, channels, or hazards.

For instance, different colors can indicate safe water, marks that should be kept to the port or starboard while navigating, or other important navigational information specific to certain waters. By paying attention to the color of a day mark, operators can make informed decisions about their navigation, ensuring they stay on course and avoid potential hazards.

While the shape of the mark may also hold importance and contribute to identifying its purpose, the color plays a crucial role in providing immediate and specific navigational instructions that need to be recognized while operating a vessel. Day marks are not designed for night use; hence, relying on them primarily during the day makes them effective navigational tools.