Jackstaff
A jackstaff is a small vertical spar or staff used on sailing vessels to carry a flag, a pennant or a burgee. It is usually mounted on the bow of the ship and is made of wood or metal. The jackstaff is an important part of the ship's decoration and is used to display the ship's colors or signal its nationality. It is also used as a reference point for taking bearings and measuring distances. In addition, the jackstaff is used to hoist signal flags to communicate with other ships or with shore stations.
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