The term hydroacoustics can be broken down into two words: hydro, mean-ing water, and acoustics, meaning sound. Hydroacoustics is the study of sound in water. In the case of the Navy, it is the study of sound energy in seawater. The Navys greatest interest in hydroacoustics is related to submarine and antisubmarine warfare or more precisely the effect of seawater on sonar. Certain properties of seawater control sound as it propagates through the water.

Their effect may aid or hinder sonar operations. In this unit, we will discuss the seawater properties that control sound in Lesson 1, and sound propagation paths in Lesson 2.

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