The English version of the "Admiralty List of Radio Signa1s (ALRS)" is divided into 6 volumes, the book number ADRS1345, ADRS2, ADRS6, the main contents of each volume are as follows: Volume 1: This volume is about Coast Radio (International Communications) data. Volume II: Including: radio navigation marks; radio time number, legal time, electronic positioning system and a large number of related charts. Volume III: includes: radio weather services, radio navigation warnings and other maritime safety information (MSI) broadcasts; relevant meteorological code groups used by ships and a large number of related charts. Volume IV: includes a list of meteorological observation stations and their related charts. Volume 5 includes: Global Maritime Distress and Safety System (GMDSS); information related to various distress, search and rescue procedures, and all services that can be provided to ships using or joining the Global Maritime Distress and Safety System. Volume 6 This volume is information about pilotage services and port operations; including all maritime radio procedures essential to assist ships in requesting pilotage services and/or port entry, and boat services including information on terminals and port VHF facilities. Attached are 75 related charts that illustrate the key details of each system or program. Include all information related to many regional, national and international ship traffic services (VTS).