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There are basically four different types of buoys we might encounter in US waters: Red, green, red and green horizontally striped, and red and white vertically striped. We will talk about special buoys further below. Each one may or may not have a light. The light color will be green, red, or white. Lights are often used where greater caution must be exercised such as a bend or narrowing of a channel. Also, especially in areas where fog may exist, some buoys make sounds such as a whistle, bell, or gong. Green and red buoys.
1 The black versus green buoy always meant the same: marks the left side of the channel when returning from a large body of water or when heading upstream but with the merger, the USWMS black buoy would be replaced, with the green buoy required by the USATONS.