Ocean Exploration SONAR SOund Navigation And Ranging A device that uses sound waves to gather information such as mapping of the ocean floor. Uses sound waves to map the ocean floor. Satellites and Sonar Satellites and Sonar are used to study ocean currents, ocean depths, salt content (salinity), temperature, wave heights, ocean life (such as fish counts), and location of things like choral reefs and ships, and to chart the migratory routes of particular fish or animals such as whales or dophins. SCUBA Self Contained Underwater Breathing Apparatus Submersibles Small underwater vehicles And now, time for the joke! R..r..r..