The main purpose of this publication is to present information in a convenient form on radio communications and radio navigational aids services provided in Canada by the Dept. of Fisheries & Oceans. Part 1 provides mariners with advance information on proposed changes to the Coast Guard Marine Communications & Traffic Services Centres, and includes the Canadian Maritime Mobile Safety & Public Correspondence communication frequencies. Parts 2 and 3 tabulate detailed operational information about individual marine communication and broadcast facilities, radio beacon stations, and the Loran-C navigation system in the Pacific area. Part 4 describes various maritime services available, together with general observations or directions for their use. For vessels with radiotelephones but without radio operators, this part also includes radiotelephony procedures. Part 5 provides all relevant information concerning Environment Canada services in marine meteorology that are delivered by the Canadian Coast Guard.