International Border Incident

[seadrift]

Canadian border officials fuel fishing flap on St. Lawrence

The gist of the story is that US citizens in a US boat (not anchored) were arrested while fishing 400 m inside Canadian waters for not informing Canadian Border Service that they had entered Canadian waters. They had a valid Ontario fishing licence and fishing was not the issue.

I’ve always understood that you can sail through the other country’s waters without informing any agency, provided you did not anchor.

So what is going on here?