Admiralty list of radio signals :   global maritime distress and safety system GMDSS.   

 - United Kingdom :   The United Kingdom Hydrographic Office ,   2004 
 - xxx, 434 pages, volume 5 :   color maps ;   30 cm.  
<br/><br/> Includes Index.  
<br/><br/><label>ISBN: </label>0707714796 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio Signals<br/>Marine Navigation.
<br/><br/><label>Dewey Class. No.: </label>623.8932  / A1