A helmsman is required to maintain a steady course, properly execute all rudder orders and communicate using navigational terms relating to heading and steering.

An AB dayworker performs general maintenance, repair, sanitation and upkeep of material, equipment, and areas in the deck department.

Dayworkers also frequently perform maintenance on lifeboats, rescue boats and life rafts, and emergency and damage control gear.

The boatswain is in charge of the able seamen and ordinary seaman that comprise the unlicensed deck crew, and reports directly to the chief mate.

For the United States Merchant Marine, the Code of Federal Regulations establishes in 46 CFR 12.05[3] examination requirements for the certification of able seamen, which includes: In 2004, studies indicate that a typical qualified Able Seaman (AB) sailing without an ITF contract might earn around $800 in total compensation; with an ITF contract total compensation is $1,300 per month.