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(c) Dennis A. Degner 2006-2011
Ordinary and Able Seaman Ratings
With only a few exceptions an OS or an AB rating is required to work on all ocean going commercial vessels of greater than 100 gross tons.
Able Seaman (AB) AB is a deck rating that requires qualifying experience, exams and approved training. The AB rating you receive is based on your qualifying experience.
AB Unlimited requires 1080 days of qualifying sea service experience on the deck of vessels operating on ocean waters.
AB Limited requires 540 days of qualifying sea service experience on the deck of vessels greater than 100 gross tons operating on ocean waters.
AB Special requires 360 days of qualifying sea service experience on the deck of vessels operating on ocean waters or on the federally navigable inland waters of the US.
AB Fishing requires 180 days of qualifying sea service experience on the deck of vessels operating on ocean waters or the federally navigable inland waters of the US.
AB OSV (Offshore Supply Vessel) requires 180 days of qualifying sea service experience on the deck of vessels operating on ocean waters or on the federally navigable inland waters of the US.
AB Sail requires 180 days of qualifying sea service experience on the deck of sailing vessels operating on ocean waters or on the federally navigable inland waters of the US.
RFPNW Rating Forming Part of a Navigational Watch (RFPNW) is an STCW endorsement that applies to Able Seaman who are part of the Navigation Watch on sea going vessels of greater than 200 gross registered tons (GRT). This rating is NOT a requirement for getting any AB rating.
To receive this rating the applicant must complete an approved course or meet the training and assessment requirements for the rating. The following forms can be used to complete the on-board assessments.
Additional Requirements for Able Seaman Lifeboatman or Lifeboatman Limited is a requirement for all Able Seaman ratings. To qualify as lifeboatman the applicant must complete an approved "Proficiency in Survival Craft" course.
Ordinary Seaman (OS) OS is an entry level rating that requires NO qualifying experience, exams or training. This position is considered an on-the-job training position. Advancement from OS can be to either the deck department as AB (Able Seaman) or to the engine room as QMED (Qualified Member of the Engine Department).