This paper addresses the increasing complexity of maritime traffic in port areas, where different vessels with different missions and technologies interact in a confined space. To improve safety and efficiency, the study proposes a parametric toolbox for assessing the manoeuvrability of large vessels based on vessel type, key parameters and environmental conditions such as wind and currents, modelled using CFD techniques. The approach extends traditional station-keeping polar plots to predict low-speed manoeuvring during port operations. The results demonstrate the ability of the toolbox to estimate vessel behaviour and suggest optimal navigation and steering commands for precise path following in confined waters.