JW FISHERS SBP1 - Sub Bottom Profiler SonarJW FISHERS SBP1 Sub Bottom Profiler Metal Detector Sub Bottom Profilers are one of the most effective tools used to identify and characterize layers of sediment or rock under the seafloor. The sub bottom profiler is similar to that of a simple echo sounder. A transducer releases a sound pulse vertically downwards towards the seafloor, and a receiver records the return of the pulse once it has been reflected off the seafloor. Unlike a simple echo