What does playing submarine mean?

What are theD Day landing boats for short called? Which of the following is against the law for Florida boating? What are main considerations before choosing what boat propellers to buy? What oil mixture do you use on a 90 cc? Where can one purchase a MotorGuide Trolling Motor? How does a boat slow down? Inboard boats after July 31st 1980 have what type of ventilation? What is a double dutch rudder? Who owns the yacht Princess Mariana? If a powerboat is operating at night from which direction should the white masthead light be visible? What is the weight limit on a 14 ft aluminum Jon boat? What is an old sailor called? How many questions in the online boating course? Is a boat easier to steer against or with the current? Do boats float differently on fresh water vs salt water? What can a submarine do that other ships can't? What is the traditional flag before setting sail? When did Germany and Britain begin u-boat warfare? What is age of power-driven machine? What would be the oil to gas ratio for a 2005 mercury 25 HP outboard?