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Azimuth circle

Azimuth circle – Instrument used to take bearings of celestial objects.

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Halyard

Halyard – Originally, ropes used for hoisting a spar with a sail attached; today, a line used to raise the head of any sail.

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Beam ends

Beam ends – The sides of a ship. “On her beam ends” may mean the vessel is literally on her side and possibly about to capsize; more often, the phrase means the vessel is listing 45 degrees or more.

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Balls to four watch

Balls to four watch – The 0000–0400 watch. (US Navy)

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Batten down the hatches

Batten down the hatches – To prepare for inclement weather, by securing the closed hatch covers with wooden battens so as to prevent water from entering from any angle.

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