The MISSION project aims to improve efficiency and reduce greenhouse gas emissions (GHG) in maritime transport by enabling just-in-time (JIT) port calls through digital coordination. Many ports still operate on a f irst-come-first-served (FCFS) basis, leading to unnecessary waiting times, fuel waste, and emissions. MISSION addresses these challenges by developing an interoperable, real-time optimization tool that supports better communication and collaboration between ships, ports, and hinterland logistics. This article presents the current state of the project.