This document provides details on the scope of the UK Marine competition to drive innovation in vessel efficiency. The competition focuses on research and development at technology readiness levels 4-6, or 3-7 for exceptional cases. Key areas of focus include weight optimization, smart materials, positioning/communications, autonomous sensing and navigation, green propulsion, and vessel design/engineering. Criteria for proposals include being within the competition's scope, demonstrating business and supply chain collaboration, efficiency improvements, dissemination plans, and value for money.