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- Q397 - Navigation General: Rivers
95. In which situation is the light characteristic of composite group flashing (2 + 1) used in the Aids to Navigation System on the Western Rivers?
Composite group flashing (2 + 1) is exclusively used on preferred-channel buoys within the U.S. Aids to Navigation System, including those on the Western Rivers, to indicate a preferred channel at a junction or bifurcation.
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