The Ordinary Seaman OS is an unlicensed entry level member of the Deck Department crew. Apply to Deckhand Seaman Tankerman and more. How To Join The Merchant Marine Mitags There are over 193 merchant mariner careers waiting for you to apply. Merchant marine jobs entry level . In just six months of sea time you can obtain your first rating and double your income. It is also known as the commercial shipping industry. In some cases experienced mariners who did not attend a merchant marine academy can qualify for a Merchant Marines license. The merchant marine is that part of the maritime trade industry concerned with transporting cargo and sometimes passengers from place to place via water routes. They assist the officers in a ships navigation and steer ships as directed by the watch officer. Seagoing Terminal and Land Operations Jobs For more than 129 years Crowley has depended on dedicated and skilled team members to provide safe and high-quality services to our customers. ...