Sub Bottom Profilers are used for a long time in geology and other oceanographic applications. This device has a much higher frequency (150kHz) and a very narrow beam (3-5 degrees). Sub bottom profilers are used by surveyors to obtain information on surficial marine sediments in cable route surveys, for pipeline route surveys, piling installations, pipeline burial & scour surveys, salvaging operations or any operation where knowledge of bottom and sub-bottom sediments is critical. Sub bottom profilers are ships hull or towed seismic devices operating in the <>3.0 kHz frequency range.