USBL hydrophone that receives acoustic signals from the “transponder” attached to an object being towed behind the survey vessel. The hydrophone is connected to a computer on the vessel and regularly sends a sound pulse to determine the location of the transponder. When not in use, the hydrophone pole is raised out of the water for maximum cruising speed. Image courtesy of Next Generation Tools 2001, NOAA-OER.

Related Links

Next Generation Tools

Kline Sidescan Sonar

Ocean Explorer Gallery