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Freeboard, in sailing and boating, means the distance from the waterline to the upper deck level, measured at the lowest point where water can enter a boat or ship. A low freeboard is often found on racing boats, for speed. A higher freeboard will give more room in the cabin, but may compromise speed. A higher freeboard also helps prevent water from getting into a boat. A low freeboard boat is suspectible to swamping in rough seas. Warships use high-freeboard designs which improve seakeeping and stability, especially aircraft carriers, which must be as stable as possible to provide a good aviation platform.
Equivalent, in the scientific investigation of sea ice, freeboard is the height of an ice floe above the water surface. A potential snow coverage is not added to the freeboard.
There is also a brand of skateboard called Freebord.
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