Admiralty list of radio signals. Vol 4. NP284 (ALRS) Meteorological Observation Stations 2025

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The Sixth Edition (2025) of ALRS Volume 4 contains the latest information received by the UKHO.
All reasonable effort has been made to ensure that this Volume contains all of the information obtained and assessed by the UKHO by the date of publication.
This edition supersedes the Fifth Edition (2024) which is cancelled.
ADMIRALTY List of Radio Signals (ALRS) provides a comprehensive source of information on all aspects of Maritime Radio Communications. The purpose of this

Сontents
Acknowledgement
Directions for updating this Volume
Annual Notices to Mariners
Contents
Preface
Purpose of Admiralty Radio Signals
How to report new or suspected dangers to navigation or changes observed in aids to navigation
Feedback
UKHO contact details
How to obtain Admiralty Charts and Publications
Related Admiralty Publications and their contents
General Information
Meteorological Observation Stations: Introduction & Abbreviations
Allocation of Station Numbers
Index of Geographical Sections
Diagram of Meteorological Observation Stations Block Numbers
Diagram of World Meteorological Organization Regions with Block Numbers
Meteorological Observation Stations
Certificate of Authenticity