GALVESTON, Texas - Seaman Aaron Sunstrom from Aids to Navigation Team Galveston inspects a marker light on the Houston Ship Channel here Thursday, June 28, 2007. Marker lights, dayboards and buoys provide a visual reference for boaters, marking areas where the water is the deepest and safest. U.S. Coast Guard photograph by Petty Officer 3rd Class Mario Romero.
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