Ordinary seaman (rank)
[1] One with more than two years' experience and considered "well acquainted with his duty" was referred to as an able seaman.Promotion from landsman to ordinary seaman required three years of experience or re-enlistment.An ordinary seaman's duties aboard ship included "handling and splicing lines, and working aloft on the lower mast stages and yards.[5] The term is still in use in the United States Merchant Marine for entry-level deck personnel; the common abbreviation is OS.In the Royal Canadian Navy, the rank of sailor third class (previously ordinary seaman until August 2020)[6][7][8] may be further qualified by the suffix "(B)" or "(R)."