Dive and Discover : Oceanographic Tools: Sonar. Echo sounding is the key method scientists use to map the seafloor today. The technique, first used by German scientists in the early 20th century, uses sound waves bounced off the ocean bottom.Click to see full answer. In this manner, why do we map the ocean floor?This map can tell scientists and resource managers important details, such as the distribution and health of a coral reef ecosystem or which areas that certain species of fish prefer for spawning. And that helps us better conserve and protect our ocean and all the creatures that live there.Secondly, how do people know what the ocean floor looks like? The Use of Sonar It estimates the depth of water by making use of the sound waves to detect an object inside the sea. On the other hand, Multibeam sonar, or a swathe, is a sound receiving and transmitting device which is typically used in surveys to decide the nature of the seabed and depth of water. Likewise, people ask, what are two methods for mapping the seafloor? There are three tools used to map the ocean floor, sonar, satellites, and submersibles. Sonar is a type of electronic depth-sounding equiptment made in the 1920’s.It is an acronym for sound navigation and ranging. Sonar is also known as echo sounding.What is at the bottom of the ocean floor?The Mariana Trench is the deepest point in the Earth’s oceans, and scientists and the National Oceanic and Atmospheric Administration are sending cameras down into its depths. Image from NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.