A vessel is often adrift to leeward side by wind pressure when she navigates in low speed such as an approaching berth. For the mariners, it is important to know the wind effect to secure the safety of the ship handling. In this research, we carried out simulation case studies, and estimated ship motion by the wind pressure. And we examined about the supporting information in approaching maneuver under wind effect, which mariners should know, based on the calculated ship motion using the simulation.