If your boat is over 4 meters, you do not need a boating license.
Source
http://www.boaterexam.com/faq_ca_en_rules.html
Source
http://www.boaterexam.com/faq_ca_en_rules.html
Q. My boat is over 4m. Why should I get the card now?
A. There are many advantages to having the card now, such as:
* Without the card, you cannot operate PWCÂ’s or powered boats under 4m (13.1 ft). This law applies not only to the boats you own, but also to any boats you operate (such as a friendÂ’s or neighbourÂ’s boat).
* Your boat insurance may increase if you do not have the Card.
* The exam will likely get harder and more expensive in the future.
* The Card is good for life (and you need to get it eventually).
* The Card is recognized across Canada and the USA