Master, C/O, AB, OS, ETO, oiler — these abbreviations look like code to newcomers. Let's break down the crew structure so you understand who's responsible for what and where you can advance.
Deck Department
- Master (Captain) — the senior officer on the vessel, full responsibility for everything.
- Chief Officer / Chief Mate (Chief Mate) — cargo, stability, deck crew; the captain's deputy.
- 2nd Officer (Second Officer) — navigation, charts, ECDIS.
- 3rd Officer (Third Officer) — lifesaving and firefighting equipment, watch duties.
- Bosun (Boatswain) — supervisor of deck ratings, the "foreman" of the deck.
- AB (Able Seaman) — qualified sailor, helm watch, deck work.
- OS (Ordinary Seaman) — entry-level deck position.
Engine Department
- Chief Engineer — the "captain of the engine room," responsible for all machinery.
- 2nd Engineer (Second Engineer) — main engine and primary systems, practical manager of the engine room.
- 3rd / 4th Engineer — auxiliary machinery, pumps, separators.
- ETO (Electro-Technical Officer) — electrical systems and automation.
- Motorman / Oiler / Wiper — engine room ratings.
- Fitter — ship's mechanic/welder.
Galley and Service (Catering)
- Chief Cook / Cook — crew meals, "half the success of a voyage."
- Messman / Steward — galley assistance, cleaning, service.
Career Path
Deck: OS → AB → Bosun → (with diploma) 3rd → 2nd → Chief Officer → Master. Engine: Wiper/Motorman → 4th → 3rd → 2nd → Chief Engineer. Each step up requires sea service and, for officers, a maritime diploma.
Know where you want to go? Find a vacancy matching your rank on seajobs.pro — the job title filter shows suitable contracts right away.