Able seaman
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An able seaman is a seaman and member of the deck department of a merchant ship with more than two years' experience at sea and considered "well acquainted with his duty". An AB may work as a watchsta
Able seamen generally serve as a ship's helmsmen, relying on visual references, compasses, and a rudder angle indicator to steer a steady course as directed by the mate or other officer on the bridge.
Dayworker AB preparing a mast for painting
Knowing how to safely work aloft to maintain cargo rigging is a skill required of an AB.
ABs were in high demand during World War II.
Ordinary seaman
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An ordinary seaman is a member of the deck department of a ship. The position is an apprenticeship to become an able seaman, and has been for centuries. In modern times, an OS is required to work on a
Able seaman
…including lifeboatman certification. The ship's boatswain, if carried, is typically a senior AB. The boatswain is in charge of the able seamen and ordinary seaman that comprise the unlicensed deck crew, and reports directly to the chief mate. The Code of Federal Regulations establishes in 46 CFR 12.05 five…
Ordinary Seaman
Ordinary seaman chipping
Ordinary seamen swabbing deck