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

 - 3rd 
 - Annapolis  Naval Instt. Press  1990 
 - xvi, 694p 
<br/><br/><label>ISBN: </label>087021294X 
<br/><br/><label>Dewey Class. No.: </label>623.89  / N90