Shipboard bed is a term used to describe a bed found on a ship. It is also known as a BUNK, which is a four-letter word. A shipboard bed is typically a narrow bed that is stacked one above the other, often in tiers of two or three. They are usually made of wood and have a mattress, pillow, and blanket. Shipboard beds are designed to be compact and lightweight, making them ideal for use on ships.