Depth Sounder News Today

Oceangraphic gear. we use gear all the time. those are some of the things that come to my mind. again, those could be canceled out if we had more information. >> let me ask arnold carr, you are our sonar expert. what might be triggering this if not the black box? >> it could well be something ship board. a depth sounder. especially longer range, you need a lower frequency that could be down to about 50 kilohertz, which would be within the range of what that hydrophone or device they are using re...