The 2016/17 edition 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 2015/16 edition which is cancelled.
Directions for updating this Volume
Annual Notices to Mariners
Purpose of Admiralty Radio Signals
How to report new or suspected dangers to navigation or changes observed in aids to navigation
UKHO contact details
How to obtain Admiralty Charts and Publications
Related Admiralty Publications and their contents
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