How would you go about mapping the seafloor when visual methods are impaired due to the inability of light to penetrate the water? Use a different method to measure it, using a wavelength that can penetrate the depths of the sea. Sound waves can penetrate the deepest depths of the ocean using special equipment produced by military and commercial companies, such as sonars, to measure the ocean floor. What is sonar? Sonar, which stands for Sound Navigation and Ranging, uses sound waves to calculate distances from objects in the water. This information can be used to produce maps of lake bottoms or seabeds. Sound waves are produced from an active sonar transducer. The sound wave travels outward from the transducer and bounces off objects on the sea floor. These waves return to the transducer and, if specially equipped, it can measure the change in force and the time taken to come back with a computer. The time between the emission and reception of the wave will allow us to calculate the distance and angle of the object on which the sound wave bounced. (NOAA, 2014). There are two different types of sonar, active sonar, which uses sound to create detailed images by sending out a wave and then recording when it returns, and passive sonar, which is used to detect sound that is not produced. by its own transducer. Active sonar will be discussed in more detail later in this article. Passive sonar is mainly used for listening purposes. It is used by the military, because being quiet in submarines is a very advantageous position to be in underwater. Also scientific research that is done by listening to objects in the ocean. Passive sonar cannot be used to locate an object, but only to listen for it, unless another passive network is used for a second reading in map quality using side scan sonar and sonar multibeam. (NOAA, 2004.) Multibeam SonarMultibeam sonar, also known as Swath echo sounder, is used for bathymetric coverage and the nature of the seafloor of a study area. It uses the time it takes for the sound wave to return to produce three-dimensional and depth features of the seafloor, also known as bathymetry. They were developed by the US Navy and General Instrument to provide underwater navigation aids to their submarine fleet. This is typically a hull-mounted sonar system that covers a swath area of ​​the seabed. Swath coverage depends on the depth of the water beneath the ship's sonar system, typically two to four times the water depth (NOAA, n.d.). Multibeam uses many transducers to produce different wavelengths along the swath so that the return wave can be