Lownsborough, Roger. <br/><br/>
Electronic aids to navigation / 
Roger Lownsborough and David Calcutt. 
 - London :  Edward Arnold,  1993. 
 - x, 246 p. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0340592583 
<br/><br/><label>LCCN: </label>g  00209683 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics in navigation. 
<br/><br/><label>Dewey Class. No.: </label>623.8933