A riverboat's a ship designed for inland navigation. These vessels are usually less sturdy than ships built for the open seas, with limited navigational and rescue equipment, as they don't have to survive the high winds or large waves characteristic on large lakes, seas or oceans. They can therefore be build from steel as well as from composite materials. Although steel's stronger, composite materials can decrease weight by up to 50% and thus decrease energy requirements, ... as well. They're l… (More on Riverboat)