Yachts on water. The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the centre-line of a ship or boat. Its purposes include carrying sail, spars, and derricks, and giving necessary height to a navigation light, look-out position, signal yard, control position, radio aerial or signal lamp.[1] Large ships have several masts, with the size and configuration depending on the style of ship. Nearly all sailing masts are guyed

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