Shakedown cruise is a nautical term for a cruise in which the performance of a ship is tested. Generally, shakedown cruises are performed before a ship enters service or after major changes such as a crew change, repair, refit, or overhaul. The shakedown cruise simulates working conditions for the vessel for various reasons. For most new ships, the primary reasons are to familiarise the crew with the new vessel and ensure all systems are functional.