The high resolution multi-beam side scan sonar (MBSS) on the Klein System 5900 improves on the performance of its predecessor System 5000, by employing advanced signal processing techniques and superior acoustic design to improve the overall along track target resolution by more than 25%. The System 5900 uses twice the number of acoustic channels available on the System 5000 series sonar along with an increase in frequency and acoustic aperture length to produce a much higher resolution along-track image. The along track resolution of the System 5900 is 5cm out to 25cm, 10cm from 25m-50m, 15cm from 50m-75m, 20cm from 75m-100m, and increases at 0.1 degrees out to a maximum range of 125m. The across track resolution of the System 5900 is constant overall operating ranges at 3.75cm.