What color is a day mark buoy?

The correct answer is that a day mark buoy is white with a green top. Day mark buoys are navigational aids used during daylight hours to indicate safe passages, hazards, or other navigational information. The white color of the buoy serves as a standard for daytime visibility, while the green top signifies safe passage or the correct side to navigate when entering a channel.

Understanding the colors is crucial for mariners, as they serve as visual cues for navigation. The use of white with a green top specifically denotes that the buoy is a safe mark, often indicating that vessels should pass to the right of it during navigation. This system of color coding is standardized to ensure consistency and safety across various waterways.

Other colors used for buoys have different meanings or signify various hazards, but the combination of a white buoy with a green top is an established guideline for identifying day mark buoys.