When is it mandatory to wear a life jacket in Canada?

The correct answer highlights the regulation that mandates wearing a life jacket in specific situations related to the size of the boat. In Canada, it is required for individuals on boats that are less than 6 meters (20 feet) long to wear a life jacket or personal flotation device (PFD) while underway. This requirement is in place to enhance safety, as smaller boats are generally less stable and may be more susceptible to capsizing or swamping compared to larger vessels.

The other options do not capture the full scope of life jacket regulations. While wearing a life jacket is undoubtedly important when a boat is moving (second choice), the law specifically targets the length of the vessel for mandatory wear. The suggestion that life jackets are only required in rough waters or at night does not align with safety guidelines, as a life jacket should always be worn regardless of sea conditions or time of day, especially on smaller boats.