An amendment to the pilot rules for boats operating on Western rivers requires that, after January 1, 1945, horn sigals must be further indacated by a visual signal such as an amber colored light light visable one mile all around the horizon. The light must operate simultaneously and in conjunction with the Horn, and be visable duriong the same period as the horn blast.
Don't cornfuse these miscreants too much.
"Western Rivers" doesn't mean rivers in the western part of the US. They are defined under Title 33 of the US Code as:
''Western Rivers'' means the Mississippi River, its
tributaries, South Pass, and Southwest Pass, to the navigational
demarcation lines dividing the high seas from harbors, rivers, and
other inland waters of the United States, and the Port Allen-Morgan
City Alternate Route, and that part of the Atchafalaya River above
its junction with the Port Allen-Morgan City Alternate Route
including the Old River and the Red River;