In order to prevent accidents at sea, the only way to prevent accidents at sea was to check the radar inside the ship or to check it with the naked eye  . However, through the advancement of technology, automatic identification between ships has become possible, and while the number of collisions has been significantly reduced, it is still  difficult to create data in the case of a management system or small ships, so it was very difficult to ensure the safety of all ships passing through the sea area.