The “Autonomous Ship” is the new technological paradigm which is driving the trend for increasing ship automation. In this context, Fincantieri Nextech launched in 2019 the MARIN (Monitoraggio Ambientale Remoto Integrato Navale, Naval Integrated Remote Environment Monitoring system) R&D project, sponsored by Regione Puglia within the framework of “Contratti di Programma”. The objective of MARIN project is to set-up and test at sea a technological demonstrator of the enabling technologies for autonomous navigation. The paper presents a technological overview of the research project and its achievement, including the preliminary results of the 2021 sea tests.