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Admiralty List of Radio Signals PDF

The Admiralty List of Radio Signals (ALRS) is a publication by the United Kingdom Hydrographic Office (UKHO) that provides information on all aspects of maritime radio communications. It is split across six volumes, each covering a different topic and updated regularly. The ALRS is an essential reference for bridge crews, as it helps them to manage communications and comply with all reporting regulations throughout a voyage.

The ALRS is available in both paper and digital formats. The paper version is published as a series of books, each with a unique number and title. The digital version is part of the Admiralty Digital Radio Signals (ADRS) package, which consists of three applications that can be accessed online or offline. The ADRS offers greater efficiency, faster updating and more flexible information access than the paper version.

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The ALRS covers the following topics:

  • Volume 1 (NP281) - Maritime Radio Stations: This volume includes radio details for global maritime communications, satellite communication services, coastguard communications, maritime telemedical assistance service (TMAS), radio quarantine and pollution reports, anti-piracy contact table, etc.

  • Volume 2 (NP282) - Radio Aids to Navigation, Differential GPS (DGPS), Legal Time, Radio Time Signals and Electronic Position Fixing System: This volume includes radio details for listing of VHF radio direction-finding stations, radar beacons (racons and ramarks), known operational automatic identification system (AIS) aids to navigation (AtoN), radio beacons transmitting DGPS corrections, international standard and daylight saving times and dates, international radio time signal broadcast details, etc.

  • Volume 3 (NP283) - Maritime Safety Information Services: This volume includes radio details for maritime weather services, radio weather and navigational warnings, NAVTEX and EGC services with comprehensive broadcast information, submarine and gunnery warning details (subfacts and gunfacts), radio-facsimile stations, frequencies and weather map areas, etc.

  • Volume 4 (NP284) - Meteorological Observation Stations: This volume includes all met observation stations listed worldwide.

  • Volume 5 (NP285) - Global Maritime Distress and Safety System (GMDSS): This volume includes worldwide communication requirements for distress, search and rescue, extracts from SOLAS and ITU regulations, distress and SAR (incorporating MRCC and MRSC contacts), NAVTEX and EGC service fundamentals, with an overview of the MSI broadcasts by each MSI fundamentals under the Worldwide Navigational Warning Service, worldwide NAVAREA and national coordinator contact details, etc.

  • Volume 6 (NP286) - Pilot Services, Vessel Traffic Services and Port Operations: This volume includes radio details for detailed pilot information, contact details and procedures, vessel traffic service information, contact details and procedures, national and international ship reporting systems, port information, contact details and procedures, etc.

If you are looking for a PDF version of the ALRS, you can download it from the UKHO website. You will need to register for an account and pay a fee to access the digital publications. Alternatively, you can also find some PDF files of the ALRS on other websites , but they may not be the latest or complete versions. Therefore, it is recommended to use the official source for the most accurate and up-to-date information.

The ALRS is a valuable resource for mariners who need to communicate effectively and safely on the seas. It provides comprehensive and reliable information on all aspects of maritime radio communications. By using the ALRS in either paper or digital format, you can ensure that you are following the best practices and standards for your voyage.


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