33 CFR § 401.65 - Communication—ports, docks and anchorages.
(a) Every vessel entering or leaving a lake port shall report to the appropriate Seaway station at the following check points:
(1) For the lake ports of Toronto and Hamilton, 1 nautical mile outside the harbor limits; and
(2) For other lake ports, when crossing the harbor entrance.
(b) Every vessel arriving at a port, dock or anchorage shall report to the appropriate Seaway station, giving an estimated time of departure if possible, and, at least four hours prior to departure, every vessel departing from a port, dock or anchorage shall report in the same way giving its destination and the expected time of arrival at the next check point.
(c) Every vessel prior to departing from a port, dock, or anchorage shall report to the appropriate Seaway station its destination and its expected time of arrival at the next check point.
(d) Every vessel intending to conduct a dive operation at a dock, wharf or approach wall shall provide a 24-hour minimum notice of diving operations to the appropriate Seaway Traffic Control Center.