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The UK Hydrographic Office series of ALRS publications (6 Volumes) is
a comprehensive source of information covering all aspects of Maritime
ALRS Volume 5
Admirality List of Radio Signals Volume 5 is a publication published by The United Kingdom Hydrographic Office. It contains a lot of up to date and well structured information about GMDSS:
AOR-E is Atlantic Ocean Region East. This region is one of the four Inmarsat satellite coverage areas
AOR-W is Atlantic Ocean Region West. This region is one of the four Inmarsat satellite coverage areas
Automatic Request for Repetition, telex mode used to send mainly routine messages from one transmitter to one receiver
CER (Character Error Rate/Ratio) : The CER, an indication of the radio signal reception property can also be added to the NAVTEX message. Usually it is added as text in the line before ZCZC indicator.
Coast Guard - A coast guard is a national organization responsible for various services at sea. However, the term implies widely different responsibilities in different countries. In most countries is concerned with SAR (for example in the UK).
Space System for the Search of Vessels in Distress