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The VDU patches below will update certified libraries on Edition 20 to 12/24.

* 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.

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*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
(Windows)
Download VDU Patch 
(Unix)
Cancelled or
New Libraries
     N/A NtM
date
H2720400 Nome Harbor, Alaska   Edition 20
       469.9 KB
  Windows
       291.9 KB
N/A -
H2720486 Bernard Harbor, Alaska   Edition 20
       143.4 KB
  Windows
       422 Bytes
N/A -
H2720490 Trent Bay, Canada N/A   Windows
       833 Bytes
N/A -
H2720491 Tuktoyaktuk Harbor, Canada N/A   Windows
       955 Bytes
N/A -
H2720492 Police Point, Wise Bay and Summers Harbor, Canada N/A   Windows
       674 Bytes
N/A -
H2720494 Pearce Point Harbor, Canada N/A   Windows
       403 Bytes
N/A -
H2720495 Tysoe Point, Canada N/A   Windows
       468 Bytes
N/A -
H2720496 Sachs Harbor and Jesse Harbor, Canada N/A   Windows
       1.0 KB
N/A -