This map illustrates the compulsory pilotage areas under the Great Lakes Pilotage Authority and Laurentian Pilotage Authority as defined by the Pilotage Act. Under the Great Lakes Pilotage Authority the map depicts five areas that are established as compulsory pilotage areas, from east to west: - Cornwall District, being the waters of the St. Lawrence River between the Port of Montréal and the pilot boarding station near Cornwall. - International District 1, being the waters of the St. Lawrence River from the boarding station near Cornwall to Kingston. - Lake Ontario District. - International District 2, being the waters of the Welland Canal, Lake Erie and the waters of the connecting channels between Lake Erie and Lake Huron. - International District 3, being the waters of Lakes Huron, Michigan and Superior including the connecting waters. Under the Laurentian Pilotage Authority the map depicts three areas that are established as compulsory pilotage areas, from south to north: - District 1.1, being the waters of the St. Lawrence River in the Port of Montréal. - District 1, being the waters of the St. Lawrence River between the Port of Montréal and Québec. - District 2, being the waters of the St. Lawrence River between Québec and Les Escoumins as well as the navigable waters of the Saguenay River.