The reviewer #1 note about the buoys that "How independent are these data, that is, they are not deployed in a very close area". We checked the locations of the buoys and, considering that some of the buoys were not independently distributed, we merged the motion parameters of the neighbouring buoys. We have explained this change in response letter. The merging of the motion parameter resulted in a change in the data of validation, and Figure 18 was plotted based on the data of validation, so Figure 18 needs to be updated. 