Which type of vessels use the navigation control services of St Lawrence Seaway?

Commercial shipping vessels utilize the navigation control services of the St. Lawrence Seaway primarily because these services are designed to facilitate the safe and efficient transit of large cargo ships. The St. Lawrence Seaway provides critical navigation aids, lock systems, and traffic management that are essential for the operation of these larger vessels that cannot be easily maneuvered or operate in confined spaces without specialized assistance.

Commercial shipping vessels transport goods and commodities, making them a key component of international trade, and they require a well-managed navigation system to ensure safe passage through the varying depths and widths of the waterway. This infrastructure is not typically needed for smaller vessels like fishing boats or recreational yachts, which may operate in shallower or more versatile waters where navigation services are less crucial. Research vessels, while they may also navigate these waters, generally do not rely on the same level of service as commercial shipping vessels for their missions.