Navtex manual: : 2017 edition. 

 - 6th edition. 
 -  International Maritime Organization,  2017 
 - iii, 43 p. 
<br/><br/>
<br/><br/><label>ISBN: </label>978-9-28011662-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Meteorology.
<br/><br/><label>Dewey Class. No.: </label>M 623.89 N327 2017