While operating in Canada, what information must the holder of a United States-issued call sign indicate at least once during a contact?

When a licensed amateur from the United States operates a station in Canada under the reciprocal operating agreement, they are required to provide specific location details to clarify where they are transmitting from. Specifically, they must state their location by city and province at least once during the communication. This requirement ensures that monitoring stations, regulatory bodies, and other operators know that the station is operating within Canadian jurisdiction, despite using a US call sign. Other options like "current grid square" or "city and state of residence" do not fulfill the regulatory requirement to identify the station's actual physical operating location within a Canadian province or territory.