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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 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
CA176030 CHS Gulf of Maine to Strait of Belle Isle 1 3,500,000 Canada
CA176140 CHS Cape Breton to Cape Cod 1 1,000,000 Canada


Cell Name Producing Authority Title Band Scale Distribution
US2EC04M NOAA West Quoddy Head to New York 2 675,000 U.S.
US2EC03M NOAA Cape Sable to Cape Hatteras 2 1,200,000 U.S.
CA276206 CHS Approaches to Bay of Fundy 2 300,000 Canada
CA276367 CHS Georges Bank – Eastern Portion 2 175,000 Canada
CA276241 CHS Bay of Fundy (Inner Portion) 2 200,000 Canada
CA276800 CHS Yarmouth to Halifax 2 300,000 Canada
US3EC10M NOAA Bay of Fundy to Cape Cod 3 378,838 U.S.
US3EC05M NOAA to be withdrawn 3 500,000 to be withdrawn
CA376330 CHS Grand Manan 3 60,000 Canada
CA376018 CHS Tusket Islands to Cape St. Marys 3 60,000 Canada
CA376044 CHS Little Hope Island to Cape St. Marys 3 150,000 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.

Usage Band 2

Usage Band 3

Revised Approach and Harbor ENCs

Cell Name






CA476035 CHS Passamaquoddy Bay and St. Croix River 4 50,000 Canada
CA476547 CHS Grand Harbour 4 25,000 Canada
US4ME50M NOAA Quoddy Narrows to Petit Manan Island 4 80,000 U.S.
US5ME57M NOAA to be withdrawn 5 50,000 to be withdrawn
CA576036 CHS Todd’s Point 5 15,000 Canada
CA576037 CHS Beaver Harbour 5 15,000 Canada
CA576038 CHS St. Andrews 5 15,000 Canada
US5ME54M NOAA Grand Manan Channel Southern Part 5 50,000 U.S.
US5ME55M NOAA Grand Manan Channel Northern Part; North Head and Flagg Cove 5 50,000 U.S.
US5ME56M NOAA Campobello Island; Eastport Harbor 5 20,000 U.S.
US6ME56M NOAA Eastport Harbor 5 5,000 U.S.
CA576034 CHS to be withdrawn 5 5,000 to be withdrawn
CA576033 CHS to be withdrawn 5 20,000 to be withdrawn
CA576546 CHS Long Island Bay 5 12,904 Canada
CA576548 CHS North Head Wharves 5 5,000 Canada

*Note: Mouseover images to see changes to ENC Coverage

No changes are proposed for Band 4.

Usage Band 4

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.

Usage Band 5

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