Industry Canada - RIC-3 - Information on the Amateur Radio Service
http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01008.html
5. Reciprocal Operating Agreements and Arrangements
5.1 Convention between Canada and the United States of America
The operation of amateur radio service equipment and stations in the territory of the other country is covered in Treaty Series 1952 No. 7 — Operation of Certain Radio Equipment or Stations, Convention between Canada and the United States of America.
Visiting amateurs are not required to register or receive a permit before operating their amateur radio stations.
Each amateur station shall indicate at least once during each contact with another station its geographical location as nearly as possible by city and state or city and province.
The amateur station shall be operated in accordance with the laws and regulations of the country in which the station is temporarily located.
U.S. amateurs operating in Canada must abide by the Radiocommunication Regulations and Radiocommunication Information Circular 2, Standards for the Operation of Radio Stations in the Amateur Radio Service (RIC-2 Reclassified as RBR-4). Those who are qualified to send and receive Morse code at a speed of at least 5 w.p.m. may operate in accordance with privileges accorded to holders of the Amateur Radio Operator Certificate with Basic, Morse code and Advanced Qualifications. U.S. amateurs who are not qualified to send and receive Morse code may operate in accordance with privileges accorded to holders of the Amateur Radio Operator Certificate with Basic Qualification.