A 4th Class Marine Engineer is responsible for operating, monitoring, and maintaining machinery and equipment in the engine room, conducting routine inspections, and supporting senior engineers with troubleshooting. They often handle tasks like checking fluid levels, inspecting pumps, performing minor repairs, and logging operational data. Teamwork is vital, as you work closely with other engineers, deck officers, and technical personnel to ensure safe vessel operations. This hands-on experience provides valuable exposure and can serve as a stepping stone for higher marine engineering licenses.