| Aspect | On Call Merchant Marine Captain | Merchant Marine Officer |
|---|
| Credentials | Valid captain's license, STCW certification | Valid officer's license, STCW certification |
| Work Environment | Leads entire vessel, responsible for navigation and safety | Performs specific duties under captain's supervision, navigational and operational roles |
| Employer & Industry Usage | Ship owners, maritime companies, cruise lines | Shipping companies, fleet operators, maritime agencies |
On Call Merchant Marine Captains are responsible for the overall operation and safety of vessels, often working on a contractual basis. Merchant Marine Officers assist in navigation and operational tasks under the captain's supervision. While both roles require similar certifications, the captain holds higher authority and responsibility onboard.