The buoy is a simple yet highly valuable tool for anyone navigating waterways, acting as important markers to alert those nearby. The anchor buoy in particular lets boaters know where they can moor.

Crewmembers of the Coast Guard Cutter George Cobb, a 175-foot coastal buoy tender homeported in San Pedro, Calif., place a yellow buoy marking the center of the San Francisco Fleet Week 2017 security ...