How to keep charts up to date: Admiralty publication NP 294  /  
United Kingdom Hydrographic Office 
 - 9th ed. 
 - Taunton  :   Admiralty publications ,   2016 
 - 126 p.   : col. ill., maps  ; 30 cm. 
<br/><br/><label>ISBN: </label>9780707741734  £ 20.70 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nautical charts
<br/><br/><label>Dewey Class. No.: </label>623.8922  / Un314/H