DESCRIZIONE
A trading system includes a monitoring device configured to monitor navigation trajectories of multiple vessels sailing on a sea, to generate monitoring information; and an offshore trading determination unit configured to, based on the navigation trajectories of the vessels included in the monitoring information received from the monitoring device, detect two or more vessels that have been in a state of being close to each other within a predetermined distance for a predetermined period of time or longer, so as to determine a likelihood that an offshore trade has been carried out between the two or more vessels. [Image Omitted]