There would be a service announcement from a steamship line for an official call or service addition-- the MTL detours are over while the remaining boxes buried on the dock are finally moving out.
Cabotage is the transport of goods or passengers between two places in the same country by a transport operator from another country.I then Googled "ship cabotage Canada" and found this article from the Cato Institute that used this interesting and relevant example:
Earlier this month [July 2020] a Panamanian‐flagged tanker, the Cabo de Hornos, left Burnaby, British Columbia bound for St. John [sic], New Brunswick where it will deliver its cargo of crude oil to a local refinery. Remarkably, this seemingly ho‐hum event would be illegal if performed in the United States. In the Land of the Free, domestic waterborne transport is subject to the Jones Act, which bars not only foreign‐registered ships from providing such services but even those built in other countries.So not only did we learn a new word today, but we also learned that the Irving refinery at Saint John gets crude oil shipped from British Columbia presumably via the Panama Canal!
In contrast, Canada has sensibly opted for a less draconian approach to its cabotage policy. Under the country’s Coasting Trade Act, Canadian‐flagged vessels are given preference for domestic transport. However, if no such vessel is available, foreign ships can be used under license (provided they meet safety and environmental requirements). It was the granting of such a license that enabled the transport of oil between two Canadian ports using a Panamanian‐flagged ship, and for a Canadian refinery to meet its oil needs from a Canadian producer.