Canada-U.S. chart coordination agreement

To comply with internationally agreed practices, Canada and the United States have agreed to eliminate overlapping coverage of Electronic Navigation Charts (ENCs).

The first area affected by the changes includes Juan de Fuca Stait, Haro Strait and Boundary Pass, was implemented December 15, 2011. Canada and the United States have resolved ENC overlaps in the Pacific and Atlantic regions and will continue this work in the Great Lakes region in 2013. This new ENC coverage scheme will result in each country changing their areas of coverage, so that only one country's ENC would be available for any given area at a particular scale.

Overlapping Regions

Changes comply with international principles

Canada and the U.S. are making these changes to comply with the International Hydrographic Organization Worldwide Electronic Navigational Chart Database (WEND) principles. Those principles include several provisions.

  • ENC duplication should be avoided. Only one country should be responsible for ENC production in any given area.
  • Responsibility for the production of ENC can be delegated in whole or in part by a country to another country, which then becomes the producing country in the considered area.
  • When the production limits are the official limits for national jurisdiction waters, commercial rights shall belong to the ENC producing country.
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