What color are cone-shaped, even-numbered nun buoys in U.S. coastal waters?

Cone-shaped, even-numbered nun buoys in U.S. coastal waters are colored red. This is part of the United States Aids to Navigation System, which uses a color-coding system to help mariners identify navigational aids and their meanings. Red nun buoys mark the right side of a channel when entering from the sea and are typically used in conjunction with green can buoys, which indicate the left side. Understanding the color and shape of these buoys is crucial for safe navigation, as they help boaters determine safe passage through channels, especially in areas with potential hazards. This color scheme is standardized and widely recognized among maritime users to promote consistency and safety on the water.