Pilot Services, Vessel Traffic Services and Port Operations Volume 6, Part 5 covers North America, Canada and Greenland. Admiralty List of Radio Signals provides a comprehensive source of information on the aspects of Maritime Radio Communications. The purpose of this volume is to provide information on pilotage, vessel traffic services, vessel reporting systems and port contact information. Author: United Kingdom Hydrographic Office Publisher: United Kingdom Hydrographic Office Edition Date: 2018/19