Shifting from land to waterborne transportation will help to preserve nature and can reduce noise, congestion, accidents and pollution. European short sea shipping and inland waterways transportation face challenges like declining crew availability and non-optimal logistics. The Horizon EU project Seamless aims to accelerate efficient unmanned operations for these segments with advancements in ship autonomy, remote control centers, cargo handling, docking, port management,and booking systems. Sintef Ocean will present plans for two full-scale demonstrations of the developed technology on the Horten-Moss and Lille-Antwerp-Duisburg loop services, scheduled for summer 2026.