To share the position informations of own ship and other ships in a two-way communication system among fishing fleet comprising a plurality of fishing ships.

A GPS antenna for receiving the position information of the own ship from a satellite, a GPS receiver for treating the position information of the own ship from the satellite, a display device for displaying the position information of the own ship treated by the GPS receiver, a controller for treating the signals of the position information of the own ship received by the GPS receiver by a program, and a wireless device for sending the position information of the own ship subjected to signal processing by the controller, and having concealing properties are mounted on each fishing ship. An identifying signal of each fishing ship is selected by a selection switch installed in the controller, and the identifying signal selected by the selection switch, and a call signal are sent by the wireless device to control the controller mounted on the other ship and to make the controller send the position information of the other ship to obtain the position information while keeping the concealing properties. The position informations of the own ship and the other ships are treated by the GPS receiver and displayed on the display device.

COPYRIGHT: (C)2008,JPO&INPIT