Admiralty list of radio signals.  Volume 5, 2023,   Global Maritime Distress and Safety System (GMDSS). 

 - Fourth edition 
 - 1 volume :  maps ;  30 cm 
<br/><br/><label>ISBN: </label>9780707747460 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio in navigation.<br/>Distress signals.<br/>Navigation--Safety measures.
<br/><br/><label>LC Class. No.: </label>VK397  / .A36 2023