followed by digits (i.e. BC123456) was issued by Service Canada on behalf of Transport Canada.
Begins with "C" (e.g., C00000BC) is a Small Commercial Vessel licensed prior to July 1, 2007 or registered after that date in the Small Vessel Registry of Transport Canada.
Old Licence numbers before 2007
Number-letter combination such as 32E9876 or 13K2345 issued as license numbers before 2007.
Here are the old prefixes: