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A high-frequency marine seismic reflection system usually involving a low-energy source, used especially in oceanographic studies, as a reconnaissance tool in conjunction with gravity and other types of surveys, in engineering studies, etc. Originally ‘‘profiler’’ meant use of a compact but weak source (often sparker) with only one or two hydrophone groups recorded by a single-channel plotter on electrosensitive paper. Profiler is now used for larger systems with stronger sources, multichannel streamers, and with data recorded on magnetic tape, so that the distinction versus conventional marine seismic work is often lost. See Figure P-15 and Sheriff and Geldart (1995, 235, 260, 506–508).