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Three important parameters are among those governing the application of the many versatile sonar techniques. Penetration and resolution depend upon pulse length and frequency. The angle of the transducer is also importantÂ¿a perpendicular beam will resolve geological strata, whereas a side-looking beam. will provide a "relief map" of the ocean terrain. Finally, several different types of transducers are available, both hull-mounted and towed, to provide the user with the best instrument for a specific application.