Hobbs, Richard R. <br/><br/>
Marine navigation : piloting and celestial and electronic navigation 

 - 3rd Ed. 
 - England  Airlife Publishing Ltd.  1990 
 - xvi, 703p. 
<br/><br/><label>ISBN: </label>9780870212949 
<br/><br/><label>Dewey Class. No.: </label>623.89  / HOB