SHOULD I RETURN THE CERTIFICATE OF DOCUMENTATION WITH THE RENEWAL NOTICE?

No, there is no reason for you to send back the old certificate when renewing it. In fact, you shouldn’t do this, since you don’t want to be without an official certificate, even if it’s just for a few days. Simply submit the forms for your Transport Canada pleasure craft licence renewal or your vessel registration renewal with the corresponding material. Keep the original certificate at hand for future reference.