Ordinary Seaman

Ordinary Seaman (commonly referred to as an OS) is the entry level USCG Merchant Mariner Rating.

An OS participates in work on deck, assists the Chief Engineer in the vessel engine room, assists the vessel cook, or may be the vessel cook.

Many who hold the OS rating quickly advance to the MMC rating of Able Seaman (AB) in advancing their career.

Interested in getting started? Check out the process list below to learn how to get your Entry Level OS rating ( or Print Friendly Version Here )


To view an interactive checklist with links to applications, schools and resources please click here to view our Interactive Map

OR view the USCG Coast Guard Checklist here