A Type B boat seat is a type of vessel that uses a barge as its primary means of propulsion. This vessel is typically used for transporting large loads of cargo or passengers over long distances. The barge is powered by either a diesel engine or a steam engine, and the vessel itself is usually steered by a rudder. The size and capacity of Type B boats can vary greatly, but they are typically much larger than other types of vessels such as yachts or pleasure craft.