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.