Admiralty list of radio signals :   radio aids to navigation, differential GPS (DGPS), legal time, radio time signals and electronic position fixing system..   

 - United Kingdom :   The United Kingdom Hydrographic Office ,   2011 
 - xiv, 290 pages, volume 2 :   color maps ;   30 cm.  
<br/><br/> Includes Index.  
<br/><br/><label>ISBN: </label>9780707719566 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio Signals<br/>Marine Navigation.
<br/><br/><label>Dewey Class. No.: </label>623.8932  / A1