Close up of the transducer that is mounted to the bottom of Research Vessel Robertson for use during the Coordinated Simultaneous Physical-Biological Sampling Using ADCP-Equipped Ocean Gliders expedition. This transducer has the ability to produce and listen for three different frequencies of sound which echo off objects or animals in the water column. The University of Washington Applied Physics Lab will use data collected by this transducer as comparison for similar datasets collected by a specially designed Seaglider.