“Lowrance's new Mark DownScan Imaging (DSI) dual-frequency sonar series delivers crystal-clear underwater detail in freshwater and saltwater.” Sandman PR This site and its contents are © Copyright TetraMedia Pty.Ltd. All Rights Reserved. Photographs are copyright by law, if you wish to use an image from Sail-world.com, Powerboat-world.com or Marinebusinessnews.com, Contact us. Click Here to close this window