The Western Rivers Marking System is a variation of the standard U.S. Aids to Navigation System and is
found on the Mississippi River and tributaries above Baton Rouge, and on certain other rivers which flow
toward the Gulf of Mexico.
• Red daybeacons, lights, and buoys mark the starboard banks and limits of channels as vessels
"return for sea" or proceed upstream.
• Green daybeacons, lights, and buoys mark the port banks and channels while going upstream.
Standard definition from some USCG publication.
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