Sounding is a term used in navigation and oceanography to describe the process of measuring the DEPTH of water. The term can also refer to the sound waves created by an object, such as a ship or submarine, when it moves through the water. The crossword solutions for the term sounding are HEARD (5 letters) and DEPTH (5 letters). HEARD is a verb that means to perceive sound, while DEPTH is a noun that refers to the distance from the top to the bottom of something. Together, these two words describe the process of measuring the DEPTH of water using sound waves.