International Maritime Organization (IMO) has adopted a strategy to reduce at least 50% of GHG emissions from the global shipping sector by 2050, compared to 2008. Preparing for these requirements, a 4-year R&D project, TNTM (Digital Transformation of Maritime Transport) was initiated. As part of this project, the current work presents the physical models that compares their outputs with actual on-board measurements on a LNG powered containership. The main propulsive systems were modelled using SEECAT (Ship Energy Efficiency Calculation and Analysis Tool), an in-house tool developed by Bureau Veritas Marine & Offshore. A custom hull performance model was developed assuming the vessel’s static equilibrium under the different forces and moments. The later have been estimated through CFD and includes calm water resistance depending on drift & rudder angles as well as added resistance by wave and wind. A simulation has been performed for a complete rotation, which lasts about 3 months between Asia and Europe. The comparison of the numerical results and the data recorded at sea were carried out. A good agreement has been obtained, the root-mean-square error during the steady state of the engine power and the fuel consumption is 7.6% and 9.1% respectively.