Apparatus and method for calculating the collison risk of a ship

A device for calculating a collision risk of a ship, the device comprising:

• at least one memory;
• and
• at least one processor,
• wherein the at least one processor is configured to
• calculate a plurality of available velocity areas based on maneuvering performance of a host ship, wherein the plurality of available velocity areas includes a first available velocity area and a second available velocity area, the first available velocity area and the second available velocity area being defined based on a degree of changes of a velocity and a movement direction of the host ship, the first available velocity area and the second available velocity area being assigned with a first weight value and a second weight value respectively the second weight value being different from the first weight value,
• calculate a possible collision area of an object and the host ship,
• calculate an overlapping area where the plurality of available velocity areas and the velocity obstacle area overlap each other;
• and
• calculate a collision risk by applying the first weight value and the second weight value to the overlapping area.