An Able Seaman (AB) is an experienced deck department rating, qualified under STCW to independently perform a broad range of deck duties.
Typical Responsibilities
- Bridge lookout duties, supporting the Officer of the Watch
- Steering the vessel (helmsman duties)
- Mooring line handling during berthing/unberthing
- Deck maintenance — chipping, painting, general upkeep
- Assisting with cargo securing and lashing
- Assisting in emergency drills and firefighting/lifesaving equipment maintenance
Where AB Sits in Rating Progression
Ordinary Seaman (OS) is typically the entry-level deck rating; with sufficient sea time and STCW-required competency verification, a seafarer progresses to Able Seaman — a recognized qualification requiring demonstrated proficiency, not simply time served.
AB Certification
STCW sets specific requirements for AB certification, including minimum sea service and demonstrated competency in required deck skills — verified through the flag state’s certification process (in India, through DG Shipping).
Career Progression Beyond AB
Experienced ABs can progress toward Bosun (senior rating, deck department supervisor) or pursue further training toward officer-track qualifications through relevant bridging programs, for those seeking to move from rating to officer status.
Exam Relevance
AB competency requirements and typical duties are covered in rating-level STCW certification, distinct from officer competency exams but referenced in officer-level training regarding crew supervision.