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2. Bosun's chair - Wikipedia

   en.wikipedia.org/wiki/Bosun's_chair

   View from the bosun's chair towards the ship deck from a height of around 15 m, the full mast height of the c. 12 m long sailing yacht. The photo was taken while a broken line running over the top of the mast was being replaced. At the Old Salt's regatta, the bosun's chair is a six-person competition.

3. Pontoon boat - Wikipedia

   en.wikipedia.org/wiki/Pontoon_boat

   A pleasure boat with two lengthwise pontoons. A pontoon boat is a flattish boat that relies on floats to remain buoyant. These pontoons (also called tubes) contain much reserve buoyancy and allow designers to create large deck plans fitted with a variety of accommodations including expansive lounge areas, stand-up bars, and sun pads.

4. Float (nautical) - Wikipedia

   en.wikipedia.org/wiki/Float_(nautical)

   A pontoon boat is a flattish boat that relies on nautical floats for buoyancy. Common boat designs are a catamaran with two pontoons, or a trimaran with three. [2] In many parts of the world, pontoon boats are used as small vehicle ferries to cross rivers and lakes. [3] An anchored raft-like platform used for diving, often referred to as a pontoon

5. Boatswain - Wikipedia

   en.wikipedia.org/wiki/Boatswain

   A boatswain (/ ˈ b oʊ s ən / BOH-sən, formerly and dialectally also / ˈ b oʊ t s w eɪ n / BOHT-swayn), bo's'n, bos'n, or bosun, also known as a deck boss, or a qualified member of the deck department, is the most senior rate of the deck department and is responsible for the components of a ship's hull.

6. Glossary of nautical terms (A–L) - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_nautical_terms...

   Also bosun's chair. 1. A short board or swatch of heavy canvas, secured in a bridle of ropes, used to hoist a man aloft or over the ship's side for painting and similar work. Modern boatswain's chairs incorporate safety harnesses to prevent the occupant from falling. 2. A metal chair used for ship-to-ship personnel transfers at sea while underway.

7. Metacentric height - Wikipedia

   en.wikipedia.org/wiki/Metacentric_height

   In a boat, the equivalent of the spring stiffness is the distance called "GM" or "metacentric height", being the distance between two points: "G" the centre of gravity of the boat and "M", which is a point called the metacentre. Metacentre is determined by the ratio between the inertia resistance of the boat and the volume of the boat. (The ...