What is the minimum age to operate a boat-unsupervised?

Do you have to pay sales tax when purchasing a used boat from a private party seller in Georgia and you live in Illinois? How many submarines did the US have in World War 2? What do operating in conditions reduced visibility? What word means to load a ship? Why does a 120 hp force outboard motor not expel water out the holes? Where could one get inner tubes that are towable behind a boat? Where are the hull numbers on a 1973 Yukon Delta? How long is an U-boat? What type of boat must have a capacity plate under federal law? Why would a bigger sail on a boat go faster than a small sail? What are the names of water vehicles? Where can you a Lake of the Ozarks boating test? When did Emma Pontin start sailing? What is the shaft length on a 1996 225 HP Evinrude Ocean Pro outboard motor? What is the fuel oil mix ratio for a 7.5 hp mercury outboard motor? If you see a red light on another boat? What sailing instruments were not yet invented during the Renaissance? What year is Montgomery wards sea king outboard motor k4001106a? Why do fiberglass boats float? What is the weight of a 60hp Mercury motor?