Final answer:
Canoes must display a Ballast Water Report (BWR) to track the source and discharge locations of ballast water.
Step-by-step explanation:
Canoes must display a Ballast Water Report (BWR) that contains information identifying the ship, transit details, and ballast water history. This is required by the US Coast Guard (USCG) and the US Environmental Protection Agency (US EPA) as part of the federal regulatory framework for ballast water discharge. The report helps track the source and discharge locations of ballast water, which is important for controlling the spread of invasive species.