The seaman's license, like the driver's license, is valid for life and forever: after training, senior seafarers are qualified to work in any shipping company. Senior crew members can also engage in management work in maritime-related enterprises and institutions, as well as shipping companies, port authorities, shipping agents, shipping trading companies, container inspection, ship inspection logistics companies, waterway engineering companies, maritime law, maritime safety administration, salvage bureau, shipyards, machinery, energy and shipyards.