The growing pressure of the international regulations on GHG emissions from ships is pushing towards the adoption of a variety of operational energy efficiency measures. The fusion of measurement techniques, smart telecommunication technologies and numerical modelling approaches has a great potential for the implementation of services for the shipping industry. Among these, there are weather routing systems for improving both energy efficiency and navigational safety. PROFUMO Demonstrator is an ESA ARTES Integrated Applications Promotion (IAP) Programme project. Its main goal is to implement a pre-operational system for fleet management and weather routing services, based on the cooperative collection of meteo-marine data from ships, to improve weather forecasts. Atmospheric information from GNSS signals (namely Galileo and GPS) are also utilised to improve numerical weather predictions and enable detailed route optimisation services at the Mediterranean scale. The architecture of the system and some first implementation results will be described, in particular on the integration of meteo-marine forecasting with ship modelling and route optimisation, with some sensitivity analyses for the optimisation process, under different approaches on modelling wind and waves added resistances for computing the ship powering performance. In perspective we imagine the use of in-service measured data to dynamically improve the ship modelling components of the system.