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The VDU patches below will update certified libraries on Edition 20 to 36/24.

* 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
A2720410 Port Clarence, Alaska   Edition 20
       822.4 KB
  Windows
       390.9 KB
N/A -
A2720460 Point Hope to Kukpowruk Pass, Alaska   Edition 20
       1.5 MB
  Windows
       231.6 KB
N/A -
A2720470 Point Lay to Peard Bay, Alaska   Edition 20
       2.0 MB
  Windows
       539.2 KB
N/A -
A2720480 Harrison Bay to Skull Cliff Vicinity, US   Edition 20
       3.5 MB
  Windows
       1.3 MB
N/A -
A2720483 Brownlow Point to Harrison Bay, Alaska   Edition 20
       3.4 MB
  Windows
       4.4 KB
N/A -
A2720486 Camden Bay to Demarcation Bay, Alaska   Edition 20
       1.6 MB
  Windows
       3.3 KB
N/A -
A2720490 McKinley Bay and Eskimo Lakes, Canada N/A   Windows
       1.1 KB
N/A -
A2720492 Approach to Police Point, Canada N/A   Windows
       720 Bytes
N/A -
A2720493 Approach to Paulatuk Harbor, Canada N/A   Windows
       547 Bytes
N/A -
COA27A Cape Kellett to Discovery Point, Canada N/A   Windows
       1.3 KB
N/A -
COA27B Norton Sound to Bering Strait, United States   Edition 20
       1.6 MB
  Windows
       371.2 KB
N/A -
COA27C East Siberian Sea, Russia N/A   Windows
       514.8 KB
N/A -
COA27D Chukchi Sea, Russia N/A   Windows
       506.7 KB
N/A -
COA27E Anadyrskiy Zaliv, Chukchi Sea, Russia N/A   Windows
       682.5 KB
N/A -
COA27F Anadyrskiy Zaliv, Russia N/A   Windows
       147.3 KB
N/A -
COA27G Demarcation Point to Amundsen Gulf, Canada N/A   Windows
       1.3 MB
N/A -
GEN27A East Siberian Sea and Anadyrskiy Zaliv, Russia N/A   Windows
       1.6 MB
N/A -
GEN27B Bering Strait, Chukchi Sea, Beaufort Sea N/A   Windows
       1.5 MB
N/A -
GEN27C Beaufort Sea, Canadian Arctic Ocean N/A   Windows
       2.9 KB
N/A -
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
       421 Bytes
N/A -
H2720490 Trent Bay, Canada N/A   Windows
       832 Bytes
N/A -
H2720491 Tuktoyaktuk Harbor, Canada N/A   Windows
       954 Bytes
N/A -
H2720492 Police Point, Wise Bay and Summers Harbor, Canada N/A   Windows
       673 Bytes
N/A -
H2720494 Pearce Point Harbor, Canada N/A   Windows
       402 Bytes
N/A -
H2720495 Tysoe Point, Canada N/A   Windows
       467 Bytes
N/A -
H2720496 Sachs Harbor and Jesse Harbor, Canada N/A   Windows
       1.0 KB
N/A -