What is a device that pushes a ship or aircraft called?

What are the alarm during boat drill? What force is used to keep a boat from sinking? I am in a boat on a fresh water lake. In my hand is a rock. I throw the rock into the lake. How is the lake's water level affected? What is the closest cruise ship terminal to Greenville SC? How much does the drilling rig cost? What should you pack for a carnival cruise? Which vessel must exhibit red and green bowlights and an all-round white light when underway at night? What is the leeward on a boat? A motorboat and a personal water craft are approaching head-on. What action should be taken? What type of vessel must have a registration number and validation decals to operate legally on pa public waters? What part of a vessel should an anchor be secured to? What is the metal fitting on boats where ropes can fastened on called? What cruise speed is the fuel reserve based on a Cessna 172? What is the gas mixture for a 48 Johnson outboard? What should you do to avoid colliding with another boat motor through crowded areas as quickly as possible stay in the middle of any marked channel look in all directions before making any turn pass? What draft does a U-boat have when fully afloat? Mercury 50 hp outboard won't go into gear? What is the fuel mix for a 1957 35 hp evinrude? Where can one find listings for jobs on cruise ships? How much is the motor yacht Callisto?