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- Q183 - Navigation General: Oceans
97. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?
A lighted buoy with a spherical topmark indicates safe water, signifying navigable water surrounding the buoy. This buoy type, characterized by red and white vertical stripes and a single red sphere topmark, is a Safe Water Mark used as a fairway or mid-channel buoy near channel entrances or harbors, distinguishing it from hazard markings, port-side channel markers, or underwater cable indicators.
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