Admiralty list of radio signals.  NP285  Vol. 5,  Global maritime distress and safety system (GMDSS) / 
Hydrographic Office. 
 - xxi, 488 pages :  color illustration, tables, maps ;  30 cm 
<br/><br/>
<br/><br/><label>ISBN: </label>9780707747309,  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aids to navigation<br/>Signals and signaling<br/>Radio in navigation
<br/><br/><label>Dewey Class. No.: </label>623.888