Computer system related to entry / exit judgment, entry / exit judgment method, and entry / exit judgment program

摘要

A computer system related to entry / exit determination includes a display unit that displays a map including a sea area, a reception unit that accepts designation of a line on the displayed map, an acquisition unit that acquires ship position information, and an acquired position information A determination to determine whether a ship enters or leaves the port according to the movement of the ship between a first area corresponding to one side of the line and a second area corresponding to the other side detected based on Part.