Before revision: Publication Frequency: Yearly Published by: National Ocean Service Available Online: United States Coast Pilots is a nine-volume American navigation publication distributed yearly by the National Oceanic and Atmospheric Administration's Office of Coast Survey .
After revision: Publication Frequency: Yearly Published by: National Ocean Service Available Online: United States Coast Pilots is a nine-volume American navigation publication distributed yearly by the National Oceanic and Atmospheric Administration's National Ocean ServiceOffice of Coast Survey, a part of the .