An instrument used in measuring the depth of water by the time required for a sound wave to travel from surface to bottom and for its echo to be returned. It may also be used for measuring the rise and fall of the tides in offshore localities.

How does the Fathometer work?

Fathometer, underwater device used on ships to measure the depth of water. As the speed of sound in water is known, the fathometer works by sending a sound down through the water, to be returned by echo. The fathometer dispatches sound through a submarine oscillator and receives it through a hydrophone echo receiver.

What is the difference between sonar and Fathometer?

Explanation: Fathometer is used to measure the ocean depth. With the help of sound waves to determine the depth of water. A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string.