St. Lawrence River and Gulf - Navigational Warnings and Notices
Canadian Coast Guard
The Canadian Coast Guard provides the following information concerning navigation hazards and notices.
Navigational Warnings (NAVWARNs)
Shoals in the waterways
St. Lawrence River, St. Mary's River, St. Clair River and Detroit River.
Notices to Mariners (NOTMAR)
The Notices to Mariners (NOTMAR) Web site provides the necessary information to update charts and nautical publications.
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