Petty Officer 1st Class Nick Ostrander, a boatswains mate from Coast Guard Aids-to-Navigation Team San Francisco, drives the 26-foot trailerable-aids-to-navigation boat toward Emerald Bay to work ATON in Lake Tahoe, Sept. 9, 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)