Petty Officer 1st Class Jeremy Estes speaks to a mariner requesting navigation assistance from Vessel Traffic Service Houston-Galveston, Monday, Sept. 28, 2015. The Coast Guard provides these services in major ports throughout the United States as a way of communicating to various mariners about port conditions that would affect safe transit in and out of ports and waterways. (U.S. Coast Guard photo by Petty Officer 3rd Class Jennifer A. Nease)