PURPOSE: To effectively surround fish schools with a cast net and improve fish catching properties in the round haul net fishing by measuring and displaying the direction and position of the cast net from the tilt directions and the tilt angles of measuring ropes attached to the tip of a boom extending in the direction intersecting the gunnel at right angles.
CONSTITUTION: A sensor unit 3 is arranged in the tip of a boom 1 extending in the direction intersecting the gunnel 2 at right angles. A surface layer measuring rope (4A) and a middle layer or low layer measuring rope (4C) are hung from a hanging hook integrally formed with an omnidirectional movable movement in the sensor unit. The direction and position of a cast net are measured from the tilt directions and tilt angles of the respective measuring ropes and displayed.
KAWAMATA SOICHI
YOSHINAGA KATSUTOSHI
MARINE GIKEN KK
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