Sonarmite BTX OEM single frequency Echo sounder (sonar) is the best choice for shallow water bathymetric surveys up to 75 meters deep. The SonarMite Echo Sounder was the result of nearly two years research and development to further extend the boundaries of shallow water hydrographic surveying equipment. Sonarmite offers reliable survey at shallow water by automatically adjusting signal quality according to depth changes, digital signal processing and filtering. 235 kHz operational frequency allows surveys to be carried out without being affected by almost any noise source.