National Navigational Warning Issuing Service

The Canadian Coast Guard’s (CCG) Marine Communications and Traffic Services (MCTS) program has launched a national navigational warning (NAVWARN) issuing service to replace the existing domestic Notice to Shipping (NOTSHIP) services.

The new NAVWARN Issuing System will provide greater harmonization in both the format and content of navigational warnings.

Visitors will be able to search NAVWARNs or subscribe to receive NAVWARNs by email, by visiting the following web page:

Notices to Shipping

Notices to shipping (NOTSHIPs) are notices concerning Navigational Aid changes or defects, fishing zones, military exercises, dredging, or other marine hazards. Contain information for all boaters and is intended to inform the marine community of hazards, current activities and other pertinent information.

Broadcast Notices to Shipping

Broadcast Notices to Shipping contain information releases of an urgent nature, broadcast through Marine Communication and Traffic Services (MCTS) Centres, where applicable. They cover the establishment, condition or change in condition of a marine facility, service, procedure, or hazard provided to the mariner and the public immediately, and remains in effect for a limited period of time or until the matter is covered by a written NOTSHIP or Notice to Mariners.

Written Notices to Shipping

Written Notices to Shipping contain information which is anticipated to remain in effect for an extended period of time as determined by the RMIC. These notices have previously been broadcast in full for an initial period of 48 hours and then placed for an additional period of 5 days, on an Active NOTSHIP List which lists the NOTSHIP number and gives a brief description of each one.

Pacific Coast

Western Region Prince Rupert MCTS Centre

Canadian Coast Guard
Bag 4444
Prince Rupert BC V8J 4K2
Telephone: 250-627-3070



Central Canada and the Arctic

Central Canada and Arctic NOTSHIPs, include:

  • Arctic Waters
  • Great Lakes Basin
  • Trent Severn Waterway
  • Lake Winnipeg
  • Mackenzie Delta
  • Mackenzie River
  • Great Slave Lake

Central and Arctic Region Iqaluit MCTS Centre

Operational from approximately mid-May until late December

“A” and “H” Series NAVWARNs

Canadian Coast Guard
P.O. Box 189
Iqaluit NU X0A 0H0

“A” Series NAVWARNs
Telephone: 867-979-5269

“H” Series NAVWARNs
Telephone: 867-979-0310

Facsimile: 867-979-4264

NAVWARN website:

Central and Arctic Region Prescott MCTS Centre

“Q” and “C” Series NAVWARNs

Canadian Coast Guard
401 King Street West
P.O. Box 1000
Prescott ON K0E 1T0

Telephone: 613-925-0666
Facsimile: 613-925-4519

NAVWARN website:



Quebec NOTSHIPs include:

  • DGPS
  • Îles de la Madeleine
  • Lac des Deux Montagnes
  • Les Escoumins to Pointe Ouest (Anticosti)
  • SLS / Melocheville to Montreal
  • Pointe Ouest (Anticosti) to Chaleur Bay
  • Pointe Ouest (Anticosti) to Blanc-Sablon
  • Port of Montreal
  • Port of Quebec
  • Port of Trois-Rivières
  • Québec to Les Escoumins
  • St. Lawrence
  • Rivière des Prairies
  • Ottawa River
  • Riviere Richelieu
  • Saguenay River
  • Sorel to Trois-Rivières
  • Trois-Rivières to Québec

Maritime Provinces

Maritime provinces NOTSHIPs, include:

  • Bay of Fundy, New Brunswick, Nova Scotia, Saint John Harbour & Saint John River
  • Cabot Strait
  • Cape Breton Island
  • Chaleur Bay
  • Chedabuco Bay
  • East Coast, Nova Scotia
  • Gulf of St. Lawrence, New Brunswick and Prince Edward Island
  • Halifax Harbour and approaches
  • Miramichi Bay and River
  • Nova Scotia
  • Northumberland Strait, New Brunswich, Nova Scotia, Prince Edward Island
  • Prince Edward Island
  • Regional
  • Sable Island
  • Southeast Coast, Nova Scotia
  • Southwest Coast, Nova Scotia
  • Strait of Canso

Atlantic Region Sydney MCTS Centre

Garde côtière canadienne
1190 chemin Westmount
Sydney  NS  B1R 2J6

Téléphone : 902-564-7751 ou 1-800-686-8676
Télécopieur : 902-564-7662

Courriel :
Site Web AVNAV :


Newfoundland and Labrador

Newfoundland and Labrador NOTSHIPs, include:

  • East Coast
  • East Coast - Northeast Coast
  • Funk Island Bank
  • Gulf of St. Lawrence
  • Labrador
  • Labrador Coast
  • Northeast Coast
  • Nothern Grand Banks
  • Northern Peninsula
  • Northwest Atlantic
  • South Coast
  • South Labrador Coast
  • South/Southwest Coast
  • Southeastern Grand Banks
  • Southwest Coast
  • Southwestern Grand Ganks
  • Strait of Belle Isle
  • West Coast

Atlantic Region Port aux Basques MCTS Centre

Canadian Coast Guard
49 Stadium Rd. 
P.O. Box 99
Port aux Basques NL A0M 1C0

Telephone: 709-695-2168 or 1-800-563-9089
Facsimile: 709-695-7784

NAVWARN website: