魚ぎょ群ぐん探たん知ち機き

noun

fishfinder; fish-finding sonar

A device that uses sonar to detect schools of fish underwater. Common in fishing and marine contexts.

• 漁りょう師しは魚ぎょ群ぐん探たん知ち機きを使つかって魚さかなの群むれを見みつけた。

  The fisherman used a fishfinder to locate a school of fish.