Saturday, March 06, 2004

Fish-finder

Also called  Netsonde,   in commercial fishing, high-frequency sonar device for locating schools of fish. It transmits sound waves downward and receives echoes from the bottom of the sea, or from intervening schools of fish, also indicating distance from ship to fish. Two different types are used, one of which is a simple “echo sounder” that points directly downward from the ship and indicates

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