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Licensed professional seafarers who work in either the deck or engine departments of Merchant Vessels. They ascend to these positions based on either Maritime College educations, or less commonly through time served and advancements 'up the hawsepipe' through testing.

Deck officers: 3RD Mate (primarily safety officer), 2ND Mate (primarily navigations officer, Chief Mate (supervisor), and Captain (overall command of vessel and personnel)

Engine Officers: 3RD Assistant Engineer, 2ND Assistant Engineer, 1ST Assistant Engineer, and Chief Engineer (in charge of entire engine room and shipboard mechanical/electrical components)

(NOTE: Steward's Department does not consist of any officers, all personnel in this department are unlicensed but certain Stewards carry more authority than others.)
Before becoming a vessel operations manager, Brian sailed as a Merchant Marine officer with Moore McCormack Lines.
by DeepSeaSailorGuy May 14, 2007
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