Eliminating Canada – U.S. ENC Overlap

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 will continue to resolve ENC overlaps in the Pacific, Atlantic and Great Lakes regions. 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
Pacific - Juan de Fuca Strait

Pacific - Dixon Entrance 		Great Lakes Atlantic

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.

Pacific - Juan de Fuca Strait

To comply with internationally agreed practices, Canada and the United States of America have agreed to eliminate overlapping coverage of Electronic Navigation Charts (ENCs). The first area where these changes will take affect are Juan de Fuca Strait, Haro Strait and Boundary Pass. 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 came into effect 0000 Coordinated Universal Time (UTC), on 15 December, 2011.

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

Revised Coastal and General ENCs

Cell Name Producing Authority Title Band Scale Distribution
US2WC12M NOAA San Francisco to Cape Flattery 2 1200000 U.S.
US3WA01M NOAA Approaches to Juan de Fuca Strait Destruction Island to Amphitrite Point 3 176253 U.S.
CA370203 CHS Approaches to/Approches à Juan de Fuca Strait 3 75000 Canada
CA370141 CHS Juan de Fuca Strait, Eastern Portion/Partie Est   80000 To be withdrawn
CA370144 CHS Juan de Fuca Strait   110000 To be withdrawn

*Note: Mouseover images to see changes to ENC Coverage

Mouseover images to see changes to ENC Coverage Mouseover images to see changes to ENC Coverage

Revised Approach and Harbor ENCs

Cell Name Producing
Authority		 Title Band Scale Distribution
US4WA34M NOAA Juan de Fuca Strait - Eastern Part 4 80000 U.S.
US5WA43M NOAA Haro-Strait-Middle Bank to Stuart Island 5 25000 U.S.
US5WA44M NOAA Boundary Pass 5 25000 U.S.
CA470075 CHS Race Rocks to/ à D'Arcy Island 4 20000 Canada
CA570101 CHS Sooke Inlet to/à Parry Bay 5 10000 Canada
CA570214 CHS Approaches to/Approches à Oak Bay 5 5000 Canada

*Note: Mouseover images to see changes to ENC Coverage

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Pacific - Dixon Entrance

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, Portland Canal coverage come into effect 0000 Coordinated Universal Time (UTC), on 26 July, 2012.

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 3500000 U.S.
Cell Name Producing
Authority		 Title Band Scale Distribution
US2AK30M NOAA Dixon Entrance to Cape St. Elias 2 969756 U.S.
CA270388 CHS Juan de Fuca Strait to/à Dixon Entrance 2 1250000 Canada
CA270390 CHS Queen Charlotte Sound to/à Dixon Entrance 2 525000 Canada
US3AK40M NOAA Dixon Entrance to Chatham Straight 3 229376 U.S.
US3AK42M NOAA Hecate Strait to Etolin Island, including Behm and Portland Canals 3 229376 U.S.
US3AK4RM NOAA Hecate Strait to Etolin Island, including Behm and Portland Canals 3 229376 U.S.
CA370190 CHS Dixon Entrance (Western/Partie ouest) 3 200000 Canada
CA370191 CHS Dixon Entrance (Eastern/Partie est) 3 200000 Canada
CA370518 CHS Portland Canal and/et Observatory Inlet 3 80000 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.

Mouseover images to see changes to ENC Coverage Mouseover images to see changes to ENC Coverage

Revised Approach and Harbor ENCs

Cell Name Producing
Authority		 Title Band Scale Distribution
US4AK49M NOAA Revillagigedo Channel 4 80000 U.S.
US4AK4SM NOAA Revillagigedo Channel, Ryus Bay, Foggy Bay 4 80000 U.S.
US4AK46M NOAA to be withdrawn 4 80000 to be withdrawn
US4AK48M NOAA to be withdrawn 4 80000 to be withdrawn
CA470363 CHS Approaches to Portland Inlet (Western Portion, Part 1 of 2)/Approches de Portland Inlet (partie Ouest, section 1/2) 4 40000 Canada
CA470364 CHS Approaches to Portland Inlet (Eastern Portion, Part 2 of 2)/Approches de Portland Inlet (partie Est, section 2/2) 4 40000 Canada
CA470269 CHS Nass Bay 4 40000 Canada
CA570080 CHS Stewart 5 12000 Canada
CA470523 CHS Portland Inlet, Khutzeymateen Inlet and/et Pearse Canal 4 40000 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.

Mouseover images to see changes to ENC Coverage

Atlantic

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 Bay of Fundy/Gulf of Maine coverage come into effect 0000 Coordinated Universal Time (UTC), on 26 July, 2012. 

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
CA176030 CHS Gulf of Maine to/à Strait of Belle Isle including/y compris Gulf of St.Lawrence/Golfe Saint-Laurent 1 3500000 Canada
CA176140 CHS Cape Breton to/à Cape Cod 1 1000000 Canada
Cell Name Producing
Authority		 Title Band Scale Distribution
US2EC04M NOAA West Quoddy Head to New York 2 675000 U.S.
US2EC03M NOAA Cape Sable to Cape Hatteras 2 1200000 U.S.
CA276206 CHS Approaches to/à Bay of Fundy 2 300000 Canada
CA276367 CHS Georges Bank/Banc de Georges - Eastern Portion/Partie Est 2 175000 Canada
CA276241 CHS Bay of Fundy (Inner Portion) 2 200000 Canada
CA276800 CHS Yarmouth to/à Halifax 2 300000 Canada
US3EC10M NOAA Bay of/de Fundy to Cape Cod 3 378838 U.S.
US3EC05M NOAA to be withdrawn 3 500000 U.S.
CA376330 CHS Grand Manan 3 60000 Canada
CA376018 CHS Tusket Islands to/au Cape St. Marys 3 60000 Canada
CA376044 CHS Little Hope Island to/à Cape St Marys 3 150000 Canada

*Note: Mouseover images to see changes to ENC Coverage

For Band 2 and 3, the United States will cut its cells in favor of Canada's cells.

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Revised Approach and Harbor ENCs

Cell Name Producing
Authority		 Title Band Scale Distribution
CA476035 CHS Passamaquoddy Bay and/et St. Croix River 4 50000 Canada
CA476547 CHS Grand Harbour 4 25000 Canada
US4ME50M NOAA Quoddy Narrows to Petit Manan Island 4 80000 U.S.
US5ME57M NOAA to be withdrawn 5 50000 to be withdrawn
CA576036 CHS Todd's Point 5 15000 Canada
CA576037 CHS Beaver Harbour 5 15000 Canada
CA576038 CHS St. Andrews 5 15000 Canada
US5ME54M NOAA Grand Manan Channel Southern Part 5 50000 U.S.
US5ME55M NOAA Grand Manan Channel Northern Part; North Head and Flagg Cove 5 50000 U.S.
US5ME56M NOAA Campobello Island; Eastport Harbor 5 20000 U.S.
US6ME56M NOAA Eastport Harbor 5 5000 to be withdrawn
CA576034 CHS Eastport Harbour 5 5000 to be withdrawn
CA576033 CHS Campobello Island 5 20000 to be withdrawn
CA576546 CHS Long Island Bay 5 12904 Canada
CA576548 CHS North Head Wharves 5 5000 Canada

*Note: Mouseover images to see changes to ENC Coverage

No changes are proposed for Band 4.

Mouseover images to see changes to ENC Coverage

For Band 5: The United States will cancel US5ME57M and cut back US5ME55M and 54M in favor of CA576546 Canada will cancel CA576034 and CA576033 in favor of US5ME56M and US6ME56M.

Mouseover images to see changes to ENC Coverage

http://www.nauticalcharts.noaa.gov/mcd/enc/USCanadaBorder.htm