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

These changes to Dixon Entrance coverage come into effect 0000 Coordinated Universal Time (UTC), on 26 July, 2012.

When the revised ENCs are available to the public a Notice to Mariner will be issued.

The following represents the ENCs that are affected by this project:

Revised Coastal and General ENCs

No changes are proposed for Band 1

Cell Name Producing Authority Title Band Scale Distribution
US1WC01M NOAA North Pacific Ocean West Coast Of North America, Mexican Border To Dixon Entrance 1 3,500,000 U.S.

 

Cell Name Producing Authority Title Band Scale Distribution
US2AK30M NOAA Dixon Entrance to Cape St. Elias 2 969,756 U.S.
CA270388 CHS Juan de Fuca Strait to Dixon Entrance 2 1,250,000 Canada
CA270390 CHS Queen Charlotte Sound to Dixon Entrance 2 525,000 Canada
US3AK40M NOAA Dixon Entrance to Chatham Straight 3 229,376 U.S.
US3AK42M NOAA Hecate Strait to Etolin Island, including Behm and Portland Canals 3 229,376 U.S.
US3AK4RM NOAA Hecate Strait to Etolin Island, including Behm and Portland Canals 3 229,376 U.S.
CA370190 CHS Dixon Entrance (Western) 3 200,000 Canada
CA370191 CHS Dixon Entrance (Eastern) 3 200,000 Canada
CA370518 CHS Portland Canal and Observatory Inlet 3 80,000 Canada

*Note: Mouseover images to see changes to ENC Coverage

For bands 2 and 3 it was agreed to cut at mutually agreed upon chart limit, with the exception of the eastern edge of the ENCs where the United States would cut back its band 3 coverage to accommodate Canada’s band 3 coverage of Dundas and Zayas Islands.

Usage Band 2

Usage Band 3

Revised Approach and Harbor ENCs

Cell Name

Producing
Authority

Title

Band

Scale

Distribution

US4AK49M NOAA Revillagigedo Channel 4 80,000 U.S.
US4AK4SM NOAA Revillagigedo Channel, Ryus Bay, Foggy Bay 4 80,000 U.S.
US4AK46M NOAA to be withdrawn 4 80,000 to be withdrawn
US4AK48M NOAA to be withdrawn 4 80,000 to be withdrawn
CA470363 CHS Approaches to Portland Inlet (Western Portion) 4 40,000 Canada
CA470364 CHS Approaches to Portland Inlet (Eastern Portion) 4 40,000 Canada
CA470269 CHS Nass Bay 4 40,000 Canada
CA570080 CHS Stewart 5 12,000 Canada
CA470523 CHS Portland Inlet, Khutzeymateen Inlet and Pearse Canal 4 40,000 Canada

*Note: Mouseover images to see changes to ENC Coverage

The United States will turn over ENC charting responsibility for the Portland Canal to Canada. Therefore the United States will cut back US4AK4SM to the bounds of CA470363 and cancel US4AK46M and US4AK48M.

Usage Band 4

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