DNC® Home     Maritime     Contact DNC®     FAQ                        
Coastal Libraries return to region


The VDU patches below will update certified libraries on Edition 44 to 24/24.

* To download individual libraries or patches, right-click on the link and choose 'Save Target As' (for IE) or 'Save Link As' (for Netscape). To download multiple files at once, use the checkboxes to select the files, and click the 'Download' button at the bottom of the list. Once the files have been downloaded, the user must use Winzip 9.0 or earlier editions to extract from the .zip files.

CoastalĀ Libraries     


*Rows highlighted below in this color are cancelled libraries since the latest New Edition.*
*Rows highlighted below in this color are new libraries available with the latest New Edition.*

IMPORTANT: As of 15 November 2021, NGA's Maritime Safety Office no longer supports DNC VDU UNIX patches. If you have questions or concerns please contact NGA via the Maritime Quality Feedback System (MQFS)

Number Name Download
full library
Download VDU Patch
Download VDU Patch 
Cancelled or
New Libraries
     N/A NtM
COA23A Vietnam N/A   Windows
       1.5 MB
N/A -
COA23B Southern China N/A   Windows
       3.2 MB
N/A -
COA23C Southeastern China, Taiwan N/A   Windows
       4.7 MB
N/A -
COA23D Eastern China N/A   Windows
       3.7 MB
N/A -
COA23E Northeastern China, Western Korea N/A   Windows
       2.4 MB
N/A -
COA23F Korea Strait N/A   Windows
       3.2 MB
N/A -
COA23G Eastern Korea, Russia N/A   Windows
       301.5 KB
N/A -
COA23H Ryukyu Islands, Japan N/A   Windows
       2.6 MB
N/A -
COA23I Northern Philippines, Luzon Strait N/A   Windows
       1.4 MB
N/A -