Coast Guard Aids-to-Navigation Team San Francisco member Fireman Arman Purganan pull up the sinker that sets the buoy in Emerald Bay, Lake Tahoe, Sept. 10, 2019. The Coast Guard is responsible for ensuring signs, symbols, buoys, markers, lighthouses, and regulations are up to date and functioning properly so recreational and commercial boaters can safely navigate the maritime environment.(U.S. Coast Guard photo by Petty Officer 2nd Class Brandon Giles/Released)