an electronic device which emits sound waves from a ships bottom to determine the depth of the water

An instrument that uses sound to measure the depth of the ocean.

a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; sonar is an acronym for sound navigation ranging; asdic is an acronym for anti-submarine detection investigation committee

A device which measures the time it takes a sound signal to travel from a ship to the ocean floor and back. This is converted into a depth reading.

An instrument for determining the DEPTH of water by measuring the time of travel of a sound-pulse from the surface of a body of water to the bottom and back.

A mechanism to determine depth by sound waves. Also called SONAR.

A machine that determines water depth by measuring the time it takes for sound waves to reach the seafloor and bounce or echo back to the surface.

A device that uses sound waves to measure the depth of surface water bodies.