Coast Guard Aids-to-Navigation Team San Francisco members Fireman Cary Meyer and Fireman Arman Purganan prepare to drop the sinker to set 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)