In conclusion the OS is an entry level apprentice rating. While the AB is a journeyman rating. In contrast, holding a Master or Mate does not qualify you as an AB. Your MMC must say AB to work as a deckhand on seagoing vessels 100 GRT and greater. The biggest mistake that a mariner can make is NOT getting an AB. The result being that too many career opportunities are missed without it.
mmc

Which License: OUPV or Master?
Which License: OUPV or Master? Which License: OUPV or Master? The answer is based on the number of passengers. Is…

Frequently Asked Questions
Frequently Asked Questions These Frequently Asked Questions I receive over email. I am always happy to answer your questions. So,…