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| | HighBeam Encyclopedia - buoy |
 | | The shape, color, number, and marking of the buoy are all significant, but unfortunately there are two competing systems of color coding which have been adopted in different parts of the world. |
 | | The International Association of Lighthouse Authorities (IALA) adopted a system in 1977 which uses red for the left-hand side of a channel returning from the sea and green for the right side. |
 | | Both systems use yellow to indicate special zones, such as fishing areas, anchorages, dredging operations, etc. Although the spar buoys (upright posts) used in northern latitudes are usually wooden, large buoys are generally made of steel or iron. |
| www.encyclopedia.com /html/b/buoy.asp (362 words) |
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