Seagull CES Crew Evaluation Test The application will help you prepare for passing computer tests Seagull CES Container - Operational level. Cargo Handling And Stowage (Detailed) The application contains 64 questions on the topic: Container - Operational level. Cargo Handling And Stowage (Detailed). The application is equipped with a convenient search. It is possible to take a practice test that you can set up yourself.