Abstract

Acoustic imagery of the ocean floor has seen great advances in recent years with the development of wide‐multibeam, swath‐mapping sonar and high‐resolution, side‐scan sonar [Tyce, 1986]. TOBI, a deep‐towed vehicle built by the Institute of Oceanographic Sciences, Wormley, U.K., is the newest of these instruments to be developed. It is towed at depths of up to 6000 m at an altitude of 400 m above the bottom. It carries a variety of sensors, including a 30‐ to 32‐kHz dual‐sided side‐scan sonar (6‐km swath), a 7.5‐kHz subbottom seismic profiler, a triaxial luxgate magnetometer, a temperature sensor, a photo‐transmissometer, and vehicle status sensors (pitch, roll, heading, speed, and hydrostatic pressure).

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