How old do you have to be to operate a boat with a certificate?

How does a submarine withstand the pressure of the ocean? What would a cabin boy do? Can you give adjectives that describe the ocean? How long does it takes to sail from Newport RI to New London CT? What is the best way to cast off if the wind or current direction is away from the dock? How old is a Johnson 4HP outboard motor serial number E3136103 model number 4wf69B? How do submarines work in the war? How big should a jib sail be relative to the mainsail? What is Yacht's silent letter? The best way to prevent a striking a swimmer with a moving boat propeller is to do what? Can you get from Mexico to el salvador by boat? What was the nicknames of the submarines in World War 2? Are submarines ships? Witch of the following is required equipment for personal watercraft? What is a moped? How do hovercrafts float? What would cause a waverunner to die after 3 minutes of running? What is the positions of the sloops or patrol boats? What is the weight of a 2002 chaparral 20 foot boat? What is the average length of a cruise ship?