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Is there a reliable source for Electronic Navigation Charts, where they get updated regularly? I am able to find for American waters on the NOAA website, but not for other regions.

  • If it’s open data that you seek then I think the place to ask is the Open Data Stack Exchange. – PolyGeo Aug 10 at 21:38
  • I am not looking for open data specifically. Even some proprietary (paid) source should work, provided it is reliable. – virtualmic Aug 13 at 5:11
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Here's a couple I was able to source. Listed in order of relevancy/trustworthiness.

http://ris.vlaanderen.be/html_en/vaarkaarten/index.html -Belgian government ENCs

http://ienccloud.us -inland USA ENCs, from the Army Geospatial center

https://www.aragon-technologies.com/en/starnavpilot/download_free_nautical_charts.php -Aragon Technologies has compiled a large list, especially for European waters

http://www.opennauticalchart.org -literally a world ENC online map. Downloadable in a variety of formats.

Less reliable:

https://sites.google.com/site/nauticalfree/ -user compiled but seems to be thorough

https://sourceforge.net/projects/opennautical/ -sourceforge open source ENC downloads

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For a non-open data option, I work at UKHO, who publish over 15000 ENCs and coverage is fully global. I believe UKHO are one of the only hydrographic offices that maintain global coverage. As you say, most countries will chart their own territorial waters only.

Updates are applied continuously and pushed out to users - I believe that you can download weekly updates (or receive them on disc).

In terms of accuracy, all the data are official and meet the requirements of the IHO standard for navigation data.

To buy ENCs, details of distributor near you can be found here.

  • Thanks; what might be the best way to purchase and access online for a Singapore/ India based company? – virtualmic Aug 19 at 10:33
  • I've edited to add a link to the distributors - it looks like there are 10+ in India and 10+ Singapore so one of those would be your best contact! – Cate Aug 19 at 13:19

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