We are using a ship handling simulator for sea pilot's training; however, in case of entering a port, it is not enough for a visual image around own ship. The general ship handling simulator does not have the visual image (screen) around own ship. We challenge to clear the effect of a visual system around own ship for entering a port. The training for entering a port is one of important training factor for a sea pilot. This paper describes characteristics of captain's visual observation area and the mental workload for ship handling when entering a port. The visual observation area comes from eye movement and the mental workload comes from heart rate variability (R-R interval), nasal temperature. The results show that the visual system around own ship gives their safe ship handling for entering a port based on eye movement.