The paper presents approximations of roll amplitudes of a S-175 containershipoccurring
in irregular waves on the basis of main service parameters. Standard
values of ship’s roll were determined by means of exact numerical methods by
using the SEAWAY software. The relationships were elaborated by means of artificial
neural networks and presented as an analytical function. The proposed approach
may be used to approximate real values of roll angle amplitude on the basis
of data recorded onboard the ship during its service.