Over the last few decades, the increase in size of container vessels has led to massive vessels carrying up to 24,000 twenty foot equivalent units. With lengths up to 400 meters and widths of over 60 meters, these giants present new challenges on port operations and infrastructure. For ports it is essential that they can accommodate these vessels to stay up to date with developments in global shipping. However, to make sure these large vessels can be moored, quays must be adjusted or new quays must be built. As these developments take much time, a short term solution can lie in the use of under-designed quays during mild weather, wave and current conditions, as in these cases the mooring force limits are not exceeded. To determine these safe mooring windows, an accurate determination of the mooring forces is required...