Oiler

Experienced rating in the engine room of a Merchant ship of the United States. Comes after seatime as a Wiper and an examination.

Duties include checking engine equipment for leaks or malfunctions, lubricating moving parts, and checking gauges. With more seatime, the Oiler can advance to QMED (qualified member of the engine department).
The Oiler was on watch from 4 to 8 doing his rounds.
by DeepSeaSailorGuy May 30, 2007
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Ordinary Seaman

Entry level deck department position aboard a Merchant Ship of the United States. After 365 days seatime, an O.S. can test for advancement to Able Bodied Seaman.

The Ordinary Seaman usually chips paint and rust, paints, splices and repairs lines, and assists (somewhat) in cargo operations and especially mooring/unmooring of the vessel.
The Captain of the ship started as an Ordinary Seaman on deck, and worked his way up the hawsepipe.
by DeepSeaSailorGuy May 30, 2007
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