DANGEROUS PLACE AND TIME CALCULATION METHOD, DANGEROUS PLACE AND TIME CALCULATION DEVICE, AND DANGEROUS PLACE AND TIME CALCULATION PROGRAM

摘要

A hot spot calculation device (10) detects, by at least two vessels, avoidance maneuvering, which is an action that indicates a possibility that each vessel has avoided a collision with another vessel, on the basis of locus data of a plurality of vessels that belongs to a predetermined area. The hot spot calculation device (10) calculates an evaluation value that indicates a possibility that avoidance maneuvering by one of the two vessels has occurred under an influence of avoidance maneuvering by another one. The hot spot calculation device (10) may more appropriately recognize a hot spot that matches an on-site feeling by calculating, on the basis of the calculated evaluation value, a collision risk in an area where a plurality of avoidance maneuvers is concentrated.