|Able Seaman (AB) Page
Able Seaman (AB) and Ordinary Seaman (OS) Information
With only a few exceptions an Ordinary Seaman or an Able Seaman rating is required
to work on all ocean going commercial vessels of greater than 100 gross tons.
Ordinary Seaman (OS) is an entry level rating that requires NO qualifying experience,
exams or training. 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
Able Seaman (AB) is a deck rating that requires qualifying sea service experience
and training. The AB rating that you receive will be based on your qualifying sea
service experience. All AB ratings require the mariner to complete an approved
Lifeboatman (Proficiency in Survival Craft) Course and one or more elements of an
approved Basic Safety Training (BST) course.
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