This project aims to create a Joint Action Plan to identify the bottlenecks of maritime passenger interconnections in the cooperation area, particularly between the continental ports and the two islands of Sardinia and Corsica. The Action Plan will identify the infrastructure needed to improve passenger transport connections, also considering the existing freight traffic of secondary and tertiary port nodes. It will also schedule cross-border actions and measures based on joint feasibility studies of passenger mobility priorities. NECTEMUS will thus produce a useful investment decision-making tool—not just for infrastructure—to be used in the programme area in conjunction with the actions already in progress and the results obtained with previous planning. The project systematises and innovates the knowledge already available; it provides a Dashboard of potential actions and priorities identified by the Joint Action Plan that exemplifies the feasibility of the proposals and their impact on cross-border passenger mobility. This Transferability Dashboard will assist institutions and operators involved in the passenger transport chain, particularly port nodes, and reclassify the project's data and analyses. NECTEMUS is the twin project of CIRCUMVECTIO, proposed by Regione Liguria and developed for the freight segment; it builds on its analyses and combines it with the passenger segment, as both share maritime transport between the Continent and the islands. It also connects with the GEECCTT-iles governance tools proposed by the OTC (Corsica Transport Office).