PURPOSE:To judge easily the fishing ground by storing once the bearing signal from the other ship, the radio wave intensity signal of said signal, the position measuring signal of the own ship and fishing data at every bearing signal and displaying the specific directional lines with the positional point on each position measuring signal value as a start point. CONSTITUTION:The bearing signal 1a of the communication radio wave of the other ship, the radio wave intensity signal 2a of said signal, the position measuring signal 3a of the own ship and the register data signal 16a for information on fishing kinds, etc. of the radio wave A are stored in a storage means 8. The contents are read out from the means 8 by an automatic means 17 or manual call means 19 and are stored in a display converting means 11. The contents are outputted as a display signal 11a to a display means 12. The directional lines S1-S6 proportional to the intensity value of the signal 2a in the direction of the bearing value from the signal 1a are displayed on the means 12 with the respective position measuring position P1-P6 which are the latitude and longitude values from the signal 3a as a start point. The operator makes judgement by reading the data on the sea region V where the multiple points thereof intersect with each other and the points P2-P4 covering said region from a table display M.
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