A new style of 3D sensor hopes to do for sonar technology what radar and GPS has done for surface navigation
Many different types of marine sonar are in use today. Some use one narrow, downward-looking beam, such as depth sounders and fish finders. Others only see a narrow slice of water. Examples of such 2D systems include sidescan sonar and small craft navigational sonars. Effective obstacle detection and avoidance, however, requires continuously updated range, bearing, and depth information on all of the underwater hazards in front of a ship.