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Shipboard Hierarchy 4: Deck Ratings, Bosun, Able Seaman and Ordinary Seaman

Faroys Team21/09/2026
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Shipboard Hierarchy, Ranks and Duties · Part 4

Deck ratings carry out the daily maintenance and operations of the ship. This team's discipline and skill directly affect the ship's safety.

Boatswain (Bosun)

  • The supervisor of the deck ratings.
  • Distributes and supervises the work received from the Chief Officer.
  • Manages mooring, anchoring, deck maintenance, painting and rope work.
  • An experienced bosun who shares knowledge is a young seafarer's best teacher.

Able Seaman (AB)

  • A certificated, experienced deck rating.
  • Keeps watch: steering the ship (helmsman) and acting as look-out.
  • Plays an active role in mooring, anchoring and deck work.
  • Earned through sea service and training.

Ordinary Seaman (OS)

  • The entry level of the deck ratings.
  • Helps with maintenance, painting, cleaning and mooring work.
  • Learns by doing and prepares for Able Seaman.

Cadet

  • A trainee who is studying to become an officer.
  • Applies knowledge learned in school and on board.
  • Keeps a record of sea service.

Safety on deck

Mooring and working aloft are among the most accident-prone jobs. A toolbox talk, correct PPE and clear communication are essential. See the mooring orders in the SMCP series.

Routes from deck rating to officer differ by country and company.

Images in this article are illustrative and used to visualise the topic.

Image source: Seebeer at German Wikipedia — CC BY-SA 3.0 — https://commons.wikimedia.org/wiki/File:Jakobsleiter.jpg

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