green buoy - A can buoy. A cylindrical buoy painted green and having an odd number used in the United States as a navigational aid. At night they may have a green light.
The Green Buoy shown in the far right picture flashes a green light every 4 seconds (Fl G 4s). This buoy marks the east side of the channel leading from the sea south to Norfolk, VA.
In both systems, green buoys are given odd numbers and red buoys are even. The numbering starts at "1" at the mouth of the harbor or river, and increases from there.
Green buoys should be kept on the left side when returning from a larger body of water to a smaller one. Captain The person who is in charge of a vessel and legally responsible for it and its occupants.
Generally, green buoys must be passed on the left side of a craft heading upstream, i.e., against the current. Red buoys must be kept on the right side of a craft when proceeding in the upstream direction.
At night they may have a green light. Green buoys should be kept on the left side when returning from a larger body of water to a smaller one. Nun buoys mark the other side of the channel. Also see green and red daymarks ...
If the green marker has several pilings supporting it, it will be called a Dolphin. Green buoys with lights will usually be found in deeper water. The light will be green.
4.
channel - The area of a waterway that is navigable; this area is typically marked by red and green buoys, where the water depth is known.
If in IALA area A, the port buoys are red. If in IALA area B (Japan, the Americas, South Korea, and the Philippines) then the 'handedness' of buoyage is reversed, and black or green buoys are left to port.
 See also: Chart, Navigation, Channel, Light, Buoy
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