Passage planning guidelines / 
Whitherby Seamanship International. 
 - 4th ed. 
 - United Kingdom:  Whitherby Seamanship International,  c2016. 
 - 146 pages :  ill., col. ;   29 cm. 
<br/><br/><label>ISBN: </label>9781856097130 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Passage planning.
<br/><br/><label>LC Class. No.: </label>CIR VK 371  / W58 2016