The HYMAR project was a 3-year, €3 million EU-funded collaboration between 9 partners to develop hybrid propulsion technology for recreational marine vehicles. The goals were to collect data on hybrid systems, fill technology gaps, develop an open systems architecture, and deliver noise/emission reductions and 30% fuel savings. Key outcomes included a new hybrid propeller, batteries, sensors, energy management system, and remote monitoring. Benefits of the collaboration included accelerated development, access to more intellectual property, and lasting industrial partnerships.